A year ago I created some apps with the default canvas method. One of these apps is named "SimpleLeerkrachten". It holds names and codes for teachers at our school. U can see this in my screenshot named "App Leerkracht.JPG". De app is connected to an (upgraded) CDS entity called "Leerkracht". U can see the fields in my screenshot named "entity Leerkracht.JPG". The app worked perfectly but now we are testing it again to add new teachers to the list. Whenever I click on the + button in the app, I can see and fill in the empty fields (p.e. field "LkrCode") Now when I click on the submit button (= a check mark in my app) I get an error saying "There is a problem with saving the data. Probably the datasource is invalid." The data is not saved in the entity. The app uses a "Submitform(EditForm1)" when I click the submit. How can I solve this issue? In the past it worked perfectly.
Thx a lot in advance for any suggestion that could lead me to a quick and defintive solution.