Many Microsoft Dynamics NAV users do not realize that NAV will accept a negative line on either a Sales Order or a Purchase Order, as well as on a Sales Invoice or Purchase Invoice.
Negative lines can be an easy way to process returns or exchanges from customers or to vendors. The only limitation is the result of the posted transaction (Sales Invoice or Purchase Invoice) cannot have a negative balance. As long as the transaction posted is not negative, everything will post. Some users have used the negative line functionality to add charges to documents like Sales Returns; through the use of a negative line, they are able to add a restocking or other fee without affecting the value of the item being returned. Negative lines are handled just like normal lines – they are received or shipped like the other lines on the document.
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