How it is achieved is not my concern. I would like to see Manager cleanly handle the range of transactions performed, fulfill reporting requirements, and preserve the intuitive interface Manager has.
I probably did not describe what I was envisioning clearly. Below is a mock up for a Sales invoice or Receipt with the suggested “Counter trade exchange” option checked. The equivalent screen for a Purchase invoice or Payment would be identical except the new “Sales” and “Purchases” labels would be reversed. Un-checking the “Counter trade exchange” option would result in the current layout.
