You normally use this program to make Funds Management (FM) productive. At this point, no FM documents are in the system. You use this program to supply documents from other components that you want to copy over to Funds Management with a complete FM account assignment. If this is the case, you are not allowed to set the indicator as the program Convert Documents, Supplementary Account Assignment and Reassignment (RFFMCHAT) does still not have any information on the FM account assignment to be reassigned.
In a productive system it may be necessary to change or supplement FM account assignments. You set this indicator if the FM documents should not be posted subsequently after running programs RFFMCHAN and RFFMCHAT, and already existing FM documents should be reassigned.