Hi,
There is no need for a 'z' program. You can first generate budget data from FMCYCOPI_CO in version A. Then run FMCYPREP to generate plan data (process PREP) from version A to version B. Wipe out the data in version A and run FMCYRESET in version B. After you are satisfied with the plan data in version B, run FMCYLOAD to generate budget (process ENTR) from version B to version 0 or a desired target version.
Regards,
Ming