Hello blue Roger,
It's better to use tr. SA38 -> RFTR_MIGRATION_EXCLUDE_OTC
This programm sets status "6 Old Transaction - No Editing Possible" to selected transactions - so it will be not possible to do any operations with the transactions.
Next time you try to edit your transaction you'll get an information:
In View mode you can find status "6 Old Transaction - No Editing P" on Status tab.
Also no TBB1, TPM1 etc is not possible.
By the time you want to edit your transactions, it will be possible to reactivate the initial status "0 Active".
Limitations: With this report you can't select securities, futures, forwards and listed options.