SAP Message BEF_CUSTOMIZING643 - A feature variable has name &1. This is not allowed

Diagnosis
A feature variable has the name &SYST-MSGV1&, this is also used instructure BEFS_GLOBAL_DATA as a field name.
Variable substitutions are derived from fields in structureBEFS_GLOBAL_DATA for generation. Feature varibles that may not differfrom those named above also lead to substituions.
Feature variables may therefore not have the same name as fields thatare used in BEFS_GLOBAL_DATA.

Procedure
Change the name of the feature variable to one that is permitted.