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I have a p-pickList that only works after having clicked once at one of the pickList-Buttons. Before I do that, the pickList is completely empty.
I am using primeng 10.0.3 with angular/cli 10.1.7

My pickList html code looks like this:

<p-pickList [source]="pickableTodoItemTemplates" [target]="pickedTodoItemTemplates"
sourceHeader="Nicht ausgewählt" targetHeader="Ausgewählt" [showSourceControls]="false" [showTargetControls]="false"
(onMoveToTarget)="onMoveToTarget($event)" (onMoveToSource)="onMoveToSource($event)">
<ng-template let-tit pTemplate="item">
<div>
<div>
{{tit.displayName}}
</div>
</div>
</ng-template>
</p-pickList>

The source and target arrays are initialized in the success-callback method of a REST-Service call that is invoked from the ngOnInit() method of the component.

Any ideas what could be missing?

var allCorect =  {! NOTISBLANK(Case.Picklist1__c) && NOTISBLANK(Case.Picklist2__c) && NOTISBLANK(Case.Picklist3__c) && NOTISBLANK(Case.Picklist4__c) && NOTISBLANK(Case.Picklist5__c)};

if(allCorrect)
    top.location = '/'+VISUAL_FlOW_URL;
else
    alert('Picklist cant be empty ');