Hi Brett Lawrence,
Do you mean reversal of 3 million FI documents ? That's a huge number to be frank. Are you talking about test system or Production ?
Could you kindly share the reason for reversing these many FI documents.
Please note that F.80 will be able to reverse only those FI documents which were initially posted in FI directly. In case those documents were posted in FI due to origination of business transaction in other module like SD, MM, etc then you need to reverse the original transaction in respective modules. You can't directly reverse those FI journals through F.80.
So, please share the circumstances leading to the decision of reversing these many documents. It will help.
Regards,
Sridhar