Sales/Purchases: Include a Categories column on Enter Sales/Purchases window

As per above, we already run Job Costing, but also run Categories, and at the moment everything is requred to be entered several times over.  This includes journals, bills and invoicing, which is very time consuming and also counter productive as we are having to enter the same invoice/bill etc with each different category, which also then flags for having duplicate invoice/purchase numbers.

There simply has to be a better way or the system needs to be rectified urgently