Reg: Account assignment Category

Hi

I have attached a raw material to a particular activity, and procured the same.

I have noticed that "Acct.Assgn.Category as N, in the Proc.paramers.

But when i have noticed Acct.Assg.cat as F for a Semi Finished Material(E-1517) in IDES.

I need clarification that, where we will configure the integration with the material types and acct.Assg. Category.

How the flow takes place in this contest.

Thanks & regards

pavan