Hi David
I believe F.50 is of no use if you are using New GL with Doc Splitting.. There is a better solution
There is a config called "Activate document splitting chars for Controlling".. In this IMG, assign the "Cost Center" as allowed cost objects
This simply means that system will inherit the CO object information from preceeding document and automatically split the discount in the same ratio (real time)
THat means, you dont need F.50 at all
Br, Ajay M