Re: SAP Error-Incorrect "Qty (Inventory UoM)" in line 15; change quantity to a different value and press tab key, then change it back to the original quantity

This is a bug with early versions of 9.0 where the line qty & the UOM qty become different. There is a SP in the system to stop the docs being added.

If you change the qty & change it back they should come back into line & allow you to add