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Advocate V
Advocate V

ComboBox Default Value Error for CDS Option Set


I have a CDS Entity (People) which has a couple of fields. One among them (RelationshipToChild) points to a CDS Option Set.

In the Canvas App I have an Edit Form pointing to the People Entity and a ComboBox in the Form pointing to the RelationshipToChild Option Set.

When I manually select an item in the ComboBox and then remove it, the ComboBox SelectedItems has ZERO items as expected.

But when the Form is initially loaded, even if the RelationshipToChild field has no data, the ComboBox SelectedItems property still returns ONE item with BLANK value. This seems to be a bug.

Why is this strange behaviour? Any help would be much appreciated.



Re: ComboBox Default Value Error for CDS Option Set

Hi @CNT ,


Do you mean when no item selected in a Combo Box the ComboBox.SelectedItems returns a record which is Blank?

Yes it is. And this is the default setting. Unlike the Dropdown Box, Combo Box by default contains an empty record. So when the form loaded, if the Option Set set to "No default value", while the Entity field is empty and without a DefaultSelectedItem, the Combo Box "looks" like empty too. 


To bypass it, if you want to use a condition that Combo Box not selected, the Blank() function would be a chiose:



Best regards,
Community Support Team _ Jeffer Ni
If this post helps, then please consider Accept it as the solution  to help the other members find it more.
Advocate V
Advocate V

Re: ComboBox Default Value Error for CDS Option Set

Hi @v-jefferni Thanks for the info. I would call it a bug rather than a default setting. Why on earth should it return a blank record when there is nothing to return? Furthermore, if you select something in the ComboBox you have 1 record (why not 2?). If you unselect what you have selected, you have 0 records (why not 1 blank record?). This inconsistent behaviour is so painful and it is nowhere documented either. hO! microsoft!

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