Manufacturing and Bin selection Issue

When creating a Picklist in GP Manufacturing is there some setting or configuration I am missing to get the system to Allocate items from bin locations THAT ACTUALLY HAVE INVENTORY!  Right now when we Allocate items when the MO is released, it is blindly allocating from the default issue bin on the item or the site.  Then we have to edit the pick doc to select the correct bins and then print it to give it to the picking team.

Thanks

Tim