Just use transaction GGB1 (Creat FI Substitution) where you can determine a condition for when BSEG-FDTAG should be changed. You can also create an exit and determine the logic of the change and how the field should be populated. To create the substitution rule, follow the path: Financial Accounting --> Complete document --> Create a step and in this step you should assign the condition for the FDTAG to be changed. Then create the exit in the exit pool assigned to the company code. This link below may help you:
Thanks. However, this function module CASH_FORECAST_LEVEL_AND_DATE under this subroutine pool SAPFF001 was overwriting the date that I have set in GGB1.
Certify if you created the step rule in the moment 3 (COMPLET DOCUMENT). Certify if you are using a payment term/condition (OBB8) because this could define FDTAG value and overcome the value inputed in GGB1 condition. Give me kudos if work. Thanks!
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