Combobox - working with default selected items

[mimii]

Hi guys ! 

I need help. In my form I have a combobox which gives me a list of names. When i select one of them, it is perfectly stored into my SharePoint list. I also added a code; when a number is selected, the second combobox (persons) should be filled. This works fine and I can also see in my collection that de default selected item is stored in the collection, but I have no idea why this is not saved in my SharePoint list. It returns no error, and all the other fields are perfectly stored as it should. 

My code is as follow:

Datacard: 

update  = comboboxNames.selected

Combobox

defaultSelectedItems = collectionDefaultSelectedManager.DisplayName 

Items = collectionPersons

Can someone help me? 🙂 

[mimii · Accepted solution]

I found the solution. I was missing First() around my collection.