RMS HQ

Does any one else know why rms does this? We do all of our PO's from HQ we pull these up from a supplier list. If i change cost of these items on the PO it does change the cost of the item in the general tab but "does not" change the cost in the supplier tab. So each time i put in a invoice i have to go in and change that cost again becuase it is using the cost in the general tab not in the supplier tab. It seems to me that if I am putting in a new cost from a PO pulled by particular supplier it would change the cost of that item from that supplier.. right???? Why does it not do that? Or at the very least RMS ought to have a worksheet that would change supplier cost of recenlty changed items. I know the STORE OPS cost with the supplier is right but when you put in invoices at HQ that doesnt help. Is anyone else having these problems is there something I am over looking? When I asked my tech support they told me I had to change every item in the item supplied. That would take for ever.