HI Melanie,
As suggested my Mr Feng.
ToF: Means to be fixed
ToR: Means to be reversed.
Say for example you have posted flow throught Tbb1 in 2 or multiple valuation area, Sometime system will not post the value in all valuation area,which can be acheieved through TPM10 TOF,
Similar way you have scenario to reverse the transaction, What you shall do is to reverse the same in FTR_Edit, Select change option then click on cash flow tab right click and try to revese the flow, Once done, You have to execute transaction in TPM10 ( ToF) to reverse the accounting entires.
Hope this help you to understand.
Regards,
Jain