You can reverse the Trade transaction updates on existing (old) account or Source account which contributed to multiple Equity Out (Split) or one-to-one (Upgrade) in OFSLL by posting TRADE REVERSAL non-monetary transaction in Customer Service > Maintenance > Transaction Batch Information section.

While posting the above transaction, select the Reason Code as STATUTORY RESCISSION or LATE RESCISSION from the drop-down list.

On successfully posting the transaction, a set of changes are done to traded accounts. Refer to Trade Reversal/Rescission and Charge-off of Account section in Appendix - Trading of Accounts chapter.