PC-DMIS 2020 R2 introduced the Geometric Tolerances functionality. When you open a measurement routine from a version before 2020 R2, any XactMeasure commands get converted to Geometic Tolerance commands. Geometric Tolerance commands are not backward compatible. This makes your measurement routine incompatible with earlier versions of PC-DMIS.
This registry entry determines whether PC-DMIS should perform a migration backup of measurement routines when you open any that were saved to a version prior to 2020 R2 in the current version.
If this entry is TRUE, PC-DMIS makes a copy of any measurement routine with a schema version before 2020 R2 to this folder:
C:\Users\Public\Documents\Hexagon\PC-DMIS\2021.1\MigrationBackup
If FALSE, PC-DMIS does not make a backup copy.
Never open this measurement routine from this backup location. If you do, the measurement routine may becomes no longer usable in versions prior to 2020 R2. If you want to use this backup measurement routine, copy it to another folder first.
Entry Name: MigrationBackup
Entry Type: TRUE or FALSE boolean value that indicates whether or not to perform the migration backup. The default value is TRUE.
For more information on migration from XactMeasure commands, see "Migration from XactMeasure" in the PC-DMIS Core documentation.