Diagnosis
You are posting a document with a document type that is marked asrelevant for official document numbering. Furthermore, the documenttype is not marked as self issuing document type, that means, theofficial document number is not automatically generated by the system.

Procedure
Enter the official document number in the reference document numberfield.

Logistic Invoice verification:
If you want to post a document that requires an automatic determinationof the official document number, please go to the header detail screenand enter an FI document type with automatic number determination inthe corresponding document type field. In this case, please do not makeany entries in the reference document number field apart from theprinting character.