SAP Message WP312 - Processing function missing for segment & (function & /&)

Diagnosis
The parser is not familiar with any processing function for segment &of the IDoc to be processed.

System Response
The system cannot process the IDoc. The documents in the SAP system arenot booked.

Procedure
There may be a number of reasons for the problem. Check whether thecorrect processing functions were assigned to the IDoc category viadefinition of the workflow transaction. If the problem cannot be solvedthis way, it is a program error. In this case, inform the SAP Hotline.