Hi @WarrenBelz,
Sorry for my late response... Thanks for the reminder.
The fields doesnt add up, because i want to add data with the collection to my sharepoint.
Maybe I should explain more, sorry my post was unclear
MyCollection ('Techniek Voorraad") list = red columns
In my App i want to collect those items and add some new value and collect it no my "uitgeleend" list.
My Lists:
Aantal = quantity of products

The app:

So the code that i use (and works for me):
ForAll(MyCollection;Collect(Uitgeleend;{Titel:Titel;Categorie:Categorie;Barcode:Barcode;project:Textcart.Text;datumretour:Datepick.SelectedDate}))
Now i added a inputfield for quantity (See green quant.text field) And i want to collect al the unique records of the field in the collection "uitgeleend". So how to do this?
I tried to add AantalUIT:quant.text after selected date, but then i get the same value.
Thanks for the help!