Reply To: Data is not always saved

Good morning Ally
I am back from vacation 🙂

The problem seems to be with the value I have in an Invisible field : {post|ID}

This field is empty after submitting, so before entering a second entry!
I need this value as primary key in the DB and generate an error when the field is empty….

What can I do, that the field is refilled with an ID after I have submitted the form?

Greetings
Peter