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It is all a bit of a mystery.
In the GDL manual STORED_PAR_VALUE and DELETED_PAR_VALUE seem to do exactly the same thing.
I figured I should use DELETED_PAR_VALUE if the parameter no longer exists in the new object, but I am guessing it doesn’t matter.
I can find no reference as to what AutoMigration does, either here in the GDL Center or the Help Center.
Or if it is there it is just hard to find.
I have always had AutoMigration turned off, so would never noticed it is a problem.
Also, I find it is easiest to use the ‘Migration’ section to find out the GUID of your new object.
You need the GUID of any old objects here – just don’t forget to delete the current object GUID once you have found out what it is and pasted to the migration script.
Otherwise the object will simply not migrate, and there will be no error messages to say why.
Versions 6.5 to 22
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision M6800 - i7 4700MQ @ 2.40GHz, 16GB RAM, AMD FirePro M6100 (2GB), Windows 7 64bit