SAP Message VL845 - No document number was assigned

Diagnosis
No number could be determined during document number assignment.

System Response
Because this is a serious error, processing was canceled and thedelivery was not saved.

Procedure
Try and repeat the operation. If the error occurs again, contact yoursystem administrator.

Procedure for System Administration
Check your settings for number assignment inCustomizing.
If you cannot determine the cause of the missing number assignment,contact SAP Support.