Just an FYI....
We just discovered this issue late Friday afternoon while trying to process some YANA adjustments and it is not applicable to only the /701 wage type.
We found that it was also turning other /7xx wage types (703, 704, 705, 706) into a positive amount when they should have been negative amounts.
I don't believe we are using the new RFC library for BSI yet, but have a message out to the basis team to confirm.