SAP Message XC120 - Internal error during conversion of CUOBJ in GUID

Diagnosis
An unexpected situation has arisen during the conversion of a CUOBJ toan external display of a configuration or vice versa. The externaldisplay is called &V1&.

System Response
Conversion cannot be performed.

Procedure
The situation can be attributed either to a program error or to aninconsistency in the database table IBEXTINST. Inform your systemadministrator.