Message no. F6097 and EA-PS 600

Hello :

I am doing an FM roll out for a client who has a Co Code running with FM being used. For 9 roll out company codes , i have configured separate FM area because of different FY. Different CO area has also been created and assigned to Co Codes. Of 9 , 7 will not use FM so when as per standard guidelines when i am trying to assign dummy FM area to any of these 7 company codes , i am getting error Message no. F6097. Account assignment Fund is being used , i also tried by deactivating Fund and then assigning FM area but still above error message has not resolved. We are on EA-PS 600. Please guide for the resolution of the error.

Thanks