Hello guys,
I have noticed a strange behaviour today when posting sales orders.
I was posting as usual and suddenly this message came up:

Then I confirmed the message with Yes and posted again and then the message did not come up anymore. The sales order was posted.
Now I have posted more sales orders and every now and then the message came up again.
Now I turned on the debugger and waited for the error to come up again and lo and behold, it has a problem with calling up the page from time to time. But I don't understand why it sometimes has a problem and sometimes not.

The page that usually opens immediately is only there for me to enter the posting date and the document date.
Do you have any idea how I could fix this?
Thank you very much.