Sorry for the question,
I found the solution: Had to select “trashed entries” in the entries-table an additional set the “date filter” to including the date of the original entry. The appearing entry could be deleted and a new submission works fine.
Thanks for a great tool
(maybe a “delete trash” button would be usefull)
Glad to hear that you have found the solution.
Thank you for your suggestion regarding the “delete trash” button. We will consider that in the future.