Diagnosis
You want to create a document and have entered the special character"*" in field Document part.
This entry is not supported when creating a document.

Procedure
Make a specific entry for the document part.
If you do not make an entry, the system creates document part000.
To see which document parts already exist, choose function Goto ->Document parts.
In this case, you do enter the special character "*" in the fieldDocument part.