AR offline Load

We create invoices from a custom build program.  We then us the AR 'Invoice 
Edit from Offline Files - List All' to create a MAPICS batch in AR.  I would 
like to automatically (unattended) this step.  When I talked to MPAICS, they 
said that there were no provisions in MAPICS for doing this.  I believe what I 
need to do is set up the 'Data areas' and call the MAPICS program. What I need 
is the location of the 'data areas' and the program to call.  I would 
appreciate it if anyone has done something like this, if they could give me 
some ideals or examples.  Not having the source, I do not know what the data 
area or parameters are needed.

Thank You,
William Moore