diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/arguments-table/calculated-field-arguments-table.component.html b/ui-ngx/src/app/modules/home/components/calculated-fields/components/arguments-table/calculated-field-arguments-table.component.html
index 4b7e516db0..d8a6c7cdb0 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/arguments-table/calculated-field-arguments-table.component.html
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/arguments-table/calculated-field-arguments-table.component.html
@@ -88,9 +88,8 @@
                                 [matTooltip]="'action.edit' | translate"
                                 matTooltipPosition="above">
                             <mat-icon
-                              [matBadgeHidden]="!(argumentsFormArray.dirty
-                                  && group.get('refEntityKey').get('type').value === ArgumentType.Rolling
-                                  && calculatedFieldType() === CalculatedFieldType.SIMPLE)"
+                              [matBadgeHidden]="!(group.get('refEntityKey').get('type').value === ArgumentType.Rolling
+                                  && calculatedFieldType === CalculatedFieldType.SIMPLE)"
                               matBadgeColor="warn"
                               matBadgeSize="small"
                               matBadge="*"
@@ -111,7 +110,7 @@
                 <span class="tb-prompt flex items-center justify-center">{{ 'calculated-fields.no-arguments' | translate }}</span>
             }
         </div>
-        @if (errorText && this.argumentsFormArray.dirty) {
+        @if (errorText) {
             <tb-error noMargin [error]="errorText | translate" class="pl-3"/>
         }
     </div>
diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/arguments-table/calculated-field-arguments-table.component.ts b/ui-ngx/src/app/modules/home/components/calculated-fields/components/arguments-table/calculated-field-arguments-table.component.ts
index a004e3db6f..3c51dc7f79 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/arguments-table/calculated-field-arguments-table.component.ts
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/arguments-table/calculated-field-arguments-table.component.ts
@@ -17,9 +17,7 @@
 import {
   ChangeDetectorRef,
   Component,
-  effect,
   forwardRef,
-  input,
   Input,
   OnChanges,
   Renderer2,
@@ -77,8 +75,7 @@ export class CalculatedFieldArgumentsTableComponent implements ControlValueAcces
   @Input() entityId: EntityId;
   @Input() tenantId: string;
   @Input() entityName: string;
-
-  calculatedFieldType = input<CalculatedFieldType>()
+  @Input() calculatedFieldType: CalculatedFieldType;
 
   errorText = '';
   argumentsFormArray = this.fb.array<AbstractControl>([]);
@@ -103,17 +100,12 @@ export class CalculatedFieldArgumentsTableComponent implements ControlValueAcces
     this.argumentsFormArray.valueChanges.pipe(takeUntilDestroyed()).subscribe(() => {
       this.propagateChange(this.getArgumentsObject());
     });
-    effect(() => {
-      if (this.calculatedFieldType() && this.argumentsFormArray.dirty) {
-        this.argumentsFormArray.updateValueAndValidity();
-      }
-    });
   }
 
   ngOnChanges(changes: SimpleChanges): void {
     if (changes.calculatedFieldType?.previousValue
       && changes.calculatedFieldType.currentValue !== changes.calculatedFieldType.previousValue) {
-      this.argumentsFormArray.markAsDirty();
+      this.argumentsFormArray.updateValueAndValidity();
     }
   }
 
@@ -142,14 +134,16 @@ export class CalculatedFieldArgumentsTableComponent implements ControlValueAcces
     if (this.popoverService.hasPopover(trigger)) {
       this.popoverService.hidePopover(trigger);
     } else {
+      const argumentObj = this.argumentsFormArray.at(index)?.getRawValue() ?? {};
       const ctx = {
         index,
-        argument: this.argumentsFormArray.at(index)?.getRawValue() ?? {},
+        argument: argumentObj,
         entityId: this.entityId,
-        calculatedFieldType: this.calculatedFieldType(),
+        calculatedFieldType: this.calculatedFieldType,
         buttonTitle: this.argumentsFormArray.at(index)?.value ? 'action.apply' : 'action.add',
         tenantId: this.tenantId,
         entityName: this.entityName,
+        usedArgumentNames: this.argumentsFormArray.value.map(({ argumentName }) => argumentName).filter(name => name !== argumentObj.argumentName),
       };
       this.popoverComponent = this.popoverService.displayPopover(trigger, this.renderer,
         this.viewContainerRef, CalculatedFieldArgumentPanelComponent, 'left', false, null,
@@ -171,7 +165,7 @@ export class CalculatedFieldArgumentsTableComponent implements ControlValueAcces
   }
 
   private updateErrorText(): void {
-    if (this.calculatedFieldType() === CalculatedFieldType.SIMPLE
+    if (this.calculatedFieldType === CalculatedFieldType.SIMPLE
       && this.argumentsFormArray.controls.some(control => control.get('refEntityKey').get('type').value === ArgumentType.Rolling)) {
       this.errorText = 'calculated-fields.hint.arguments-simple-with-rolling';
     } else if (!this.argumentsFormArray.controls.length) {
diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/dialog/calculated-field-dialog.component.html b/ui-ngx/src/app/modules/home/components/calculated-fields/components/dialog/calculated-field-dialog.component.html
index ac60ae8178..8d69bf6539 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/dialog/calculated-field-dialog.component.html
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/dialog/calculated-field-dialog.component.html
@@ -65,7 +65,7 @@
       </div>
       <ng-container [formGroup]="configFormGroup">
         <div class="tb-form-panel">
-          <div class="tb-form-panel-title">{{ 'calculated-fields.arguments' | translate }}</div>
+          <div class="tb-form-panel-title tb-required">{{ 'calculated-fields.arguments' | translate }}</div>
           <tb-calculated-field-arguments-table
             formControlName="arguments"
             [entityId]="data.entityId"
@@ -75,7 +75,7 @@
           />
         </div>
         <div class="tb-form-panel">
-          <div class="tb-form-panel-title">{{ 'calculated-fields.expression' | translate }}*</div>
+          <div class="tb-form-panel-title tb-required">{{ 'calculated-fields.expression' | translate }}</div>
           @if (fieldFormGroup.get('type').value === CalculatedFieldType.SIMPLE) {
             <mat-form-field class="mat-block" appearance="outline">
               <input matInput formControlName="expressionSIMPLE" maxlength="255" [placeholder]="'action.set' | translate" required>
diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/panel/calculated-field-argument-panel.component.html b/ui-ngx/src/app/modules/home/components/calculated-fields/components/panel/calculated-field-argument-panel.component.html
index d274c30b8f..4e9819a786 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/panel/calculated-field-argument-panel.component.html
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/panel/calculated-field-argument-panel.component.html
@@ -31,7 +31,15 @@
                       class="tb-error">
               warning
             </mat-icon>
-          } @else if (argumentFormGroup.get('argumentName').touched && argumentFormGroup.get('argumentName').hasError('pattern')) {
+          } @else if (argumentFormGroup.get('argumentName').touched && argumentFormGroup.get('argumentName').hasError('duplicateName')) {
+          <mat-icon matSuffix
+                    matTooltipPosition="above"
+                    matTooltipClass="tb-error-tooltip"
+                    [matTooltip]="'calculated-fields.hint.argument-name-duplicate' | translate"
+                    class="tb-error">
+            warning
+          </mat-icon>
+        } @else if (argumentFormGroup.get('argumentName').touched && argumentFormGroup.get('argumentName').hasError('pattern')) {
             <mat-icon matSuffix
                       matTooltipPosition="above"
                       matTooltipClass="tb-error-tooltip"
@@ -103,25 +111,24 @@
               <tb-entity-key-autocomplete class="flex-1" formControlName="key" [dataKeyType]="DataKeyType.timeseries" [entityFilter]="entityFilter"/>
             </div>
           } @else {
-            <div class="tb-form-row">
-              <div class="fixed-title-width tb-required">{{ 'calculated-fields.attribute-scope' | translate }}</div>
-              <mat-form-field appearance="outline" subscriptSizing="dynamic" class="flex-1">
-                <mat-select formControlName="scope">
-                  <mat-option [value]="AttributeScope.SERVER_SCOPE">
-                    {{ 'calculated-fields.server-attributes' | translate }}
-                  </mat-option>
-                  @if (entityType === ArgumentEntityType.Device
-                  || entityType === ArgumentEntityType.Current && entityId.entityType === EntityType.DEVICE) {
+            @if (enableAttributeScopeSelection) {
+              <div class="tb-form-row">
+                <div class="fixed-title-width tb-required">{{ 'calculated-fields.attribute-scope' | translate }}</div>
+                <mat-form-field appearance="outline" subscriptSizing="dynamic" class="flex-1">
+                  <mat-select formControlName="scope">
+                    <mat-option [value]="AttributeScope.SERVER_SCOPE">
+                      {{ 'calculated-fields.server-attributes' | translate }}
+                    </mat-option>
                     <mat-option [value]="AttributeScope.CLIENT_SCOPE">
                       {{ 'calculated-fields.client-attributes' | translate }}
                     </mat-option>
                     <mat-option [value]="AttributeScope.SHARED_SCOPE">
                       {{ 'calculated-fields.shared-attributes' | translate }}
                     </mat-option>
-                  }
-                </mat-select>
-              </mat-form-field>
-            </div>
+                  </mat-select>
+                </mat-form-field>
+              </div>
+            }
             <div class="tb-form-row">
               <div class="fixed-title-width tb-required">{{ 'calculated-fields.attribute-key' | translate }}</div>
               <tb-entity-key-autocomplete
diff --git a/ui-ngx/src/app/modules/home/components/calculated-fields/components/panel/calculated-field-argument-panel.component.ts b/ui-ngx/src/app/modules/home/components/calculated-fields/components/panel/calculated-field-argument-panel.component.ts
index 510bdd95f3..a2e5545926 100644
--- a/ui-ngx/src/app/modules/home/components/calculated-fields/components/panel/calculated-field-argument-panel.component.ts
+++ b/ui-ngx/src/app/modules/home/components/calculated-fields/components/panel/calculated-field-argument-panel.component.ts
@@ -16,7 +16,7 @@
 
 import { ChangeDetectorRef, Component, Input, OnInit, output } from '@angular/core';
 import { TbPopoverComponent } from '@shared/components/popover.component';
-import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+import { FormBuilder, FormControl, FormGroup, ValidatorFn, Validators } from '@angular/forms';
 import { charsWithNumRegex, noLeadTrailSpacesRegex } from '@shared/models/regex.constants';
 import {
   ArgumentEntityType,
@@ -52,11 +52,12 @@ export class CalculatedFieldArgumentPanelComponent implements OnInit {
   @Input() tenantId: string;
   @Input() entityName: string;
   @Input() calculatedFieldType: CalculatedFieldType;
+  @Input() usedArgumentNames: string[];
 
   argumentsDataApplied = output<{ value: CalculatedFieldArgumentValue, index: number }>();
 
   argumentFormGroup = this.fb.group({
-    argumentName: ['', [Validators.required, Validators.pattern(charsWithNumRegex), Validators.maxLength(255)]],
+    argumentName: ['', [Validators.required, this.uniqNameRequired(), Validators.pattern(charsWithNumRegex), Validators.maxLength(255)]],
     refEntityId: this.fb.group({
       entityType: [ArgumentEntityType.Current],
       id: ['']
@@ -109,6 +110,12 @@ export class CalculatedFieldArgumentPanelComponent implements OnInit {
     return this.argumentFormGroup.get('refEntityKey') as FormGroup;
   }
 
+  get enableAttributeScopeSelection(): boolean {
+    return this.entityType === ArgumentEntityType.Device
+      || (this.entityType === ArgumentEntityType.Current
+        && (this.entityId.entityType === EntityType.DEVICE || this.entityId.entityType === EntityType.DEVICE_PROFILE))
+  }
+
   ngOnInit(): void {
     this.argumentFormGroup.patchValue(this.argument, {emitEvent: false});
     this.currentEntityFilter = getCalculatedFieldCurrentEntityFilter(this.entityName, this.entityId);
@@ -188,9 +195,21 @@ export class CalculatedFieldArgumentPanelComponent implements OnInit {
         this.argumentFormGroup.get('refEntityId').get('id').setValue('');
         this.argumentFormGroup.get('refEntityId')
           .get('id')[type === ArgumentEntityType.Tenant || type === ArgumentEntityType.Current ? 'disable' : 'enable']();
+        if (!this.enableAttributeScopeSelection) {
+          this.refEntityKeyFormGroup.get('scope').setValue(AttributeScope.SERVER_SCOPE);
+        }
       });
   }
 
+  private uniqNameRequired(): ValidatorFn {
+    return (control: FormControl) => {
+      const newName = control.value.trim().toLowerCase();
+      const isDuplicate = this.usedArgumentNames?.some(name => name.toLowerCase() === newName);
+
+      return isDuplicate ? { duplicateName: true } : null;
+    };
+  }
+
   private observeEntityKeyChanges(): void {
     this.argumentFormGroup.get('refEntityKey').get('type').valueChanges
       .pipe(takeUntilDestroyed())
diff --git a/ui-ngx/src/app/shared/import-export/import-export.service.ts b/ui-ngx/src/app/shared/import-export/import-export.service.ts
index 0a49acf8b6..18000bcd4f 100644
--- a/ui-ngx/src/app/shared/import-export/import-export.service.ts
+++ b/ui-ngx/src/app/shared/import-export/import-export.service.ts
@@ -997,7 +997,6 @@ export class ImportExportService {
       && !!Object.keys(configuration.arguments).length
       && isDefined(configuration.expression)
       && isDefined(configuration.output)
-      && isNotEmptyStr(configuration.output.name);
   }
 
   private validateImportedImage(image: ImageExportData): boolean {
diff --git a/ui-ngx/src/assets/locale/locale.constant-en_US.json b/ui-ngx/src/assets/locale/locale.constant-en_US.json
index 9bdf533fef..d17409e52d 100644
--- a/ui-ngx/src/assets/locale/locale.constant-en_US.json
+++ b/ui-ngx/src/assets/locale/locale.constant-en_US.json
@@ -1064,6 +1064,7 @@
             "expression-max-length": "Expression length should be less than 255 characters.",
             "argument-name-required": "Argument name is required.",
             "argument-name-pattern": "Argument name is invalid.",
+            "argument-name-duplicate": "Argument with such name already exists.",
             "argument-name-max-length": "Argument name should be less than 256 characters.",
             "argument-type-required": "Argument type is required."
         }
diff --git a/ui-ngx/src/form.scss b/ui-ngx/src/form.scss
index 0ae2b9584b..4c00a330c7 100644
--- a/ui-ngx/src/form.scss
+++ b/ui-ngx/src/form.scss
@@ -163,6 +163,13 @@
   .tb-form-panel-title {
     font-weight: 500;
     font-size: 16px;
+
+    &.tb-required::after {
+      font-size: 13px;
+      color: rgba(0, 0, 0, .54);
+      vertical-align: top;
+      content: " *";
+    }
   }
   .tb-form-panel-hint {
     font-size: 12px;