SAP Message 00079 - Internal error with matchcode selection (notify person responsible)

Diagnosis
An internal error was found during matchcode selection.
The possible causes are :
RESET N1
There was no key field transferred by the matchcode interface or it hasa length of 0.
Table RSMDY could not be created for the matchcode interface.

Procedure
RESET N1
Check the matchcode description.
Contact the persons in charge.