The order quantity for one of the lines was reduced or changed to zero after invoice has been generated. The quantity shown in the invoice is correct but the sales order order quantity becomes 0.
Eg.
Before invoicing in Sales Order
Qty = 1
Qty to ship = 1
After invoicing in Sales order
Qty = 0 << error!!
Qty invoiced = 1
After invoicing in Invoice
Qty = 1
Anyone can explain why the error?