The error 'Entries applied to a Correction entry cannot be unapplied' usually means some item ledger entries are linked to a correction (cost adjustment or manual application).
You cannot directly unapply them.
Try this:
Go to the Item Ledger Entries → find the related entries
Check Applied Entries for anything marked as Correction
Reverse or correct via a proper document (adjustment, return, etc.) instead of unapplying
If stuck, delete & recreate the Transfer Order (if not posted yet)
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