While your SAP BW system is evolving over the years number of BEx’s variables is growing. With new version of there are coming even new types of those variables or existing types are being enhanced. Table (RSZGLOBV) which stores all the variables became huge. Even some entries in there become not up-to-date as rules for certain variables have changed. To keep this table consistent SAP introduced ABAP report. It is called SAP_GLOBV_CHECK. Basically it scans RSZGLOBV table; finds inconsistencies with variable rules and even corrects such entries. The report is available as of SP 26 for BW 7.0 and respective versions.
For detailed info on the report see following SAP Note: