If your migrated objects have the same names then you just have to open the object that CALLs them both and resave it.
This will reset the GUID - although we CALL by name, Archicad actually stores the GUID of that object in the script.
If they have new names then as Erwin said you have to change the names in the CALLs in the script otherwise it will be looking for an object that doesn't exist anymore and will not migrate them like it does for a single object.
Barry.
One of the forum moderators.
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