GL Accounts posting

["Paul LaFlamme" <laflammep@xxxxxxxxxxxxx>]

Hi everyone, I used to think I knew how this works, but now I'm not
sure. 
 
We're running BPCS 4.05CD and some of our items we invoice post to the
wrong GL account. How is this controlled? Is it at the customer, item,
class or type level, some combination of all of them? 
 
The reason this is important for us is we have two types of items we
invoice. One is for the die castings which post to a certain account on
the GL and another for tooling which should post to another account. 
 
Any insight would be appreciated.
 
Thank You,
 
Paul LaFlamme
Manager of MIS
Kennedy Die Castings, Inc.