New Quote does not get autonumbered Quote ID

Dear Community,

After searching for several hours I can not find the right solution.
When we create a new Quote from the Quotes entity the Quote ID (quotenumber) was always filled automatically by the autonumbering  (LQU-xxxx-xxx).

But when we create a new quote now the field stays empty, Saving the quote gives the error that we need to fill in a quote ID.

We do not know what went wrong, we have not changed anything the past months.

Someone have had some similar issue before?

Thanks in advance,

Sincerely,

Joey