Field help (QTYUOM1) 

This is the invoiced quantity expressed by default in purchase unit. The initialization value of this quantity depends on the PIHQTYAQR - Invoiceable quantity parameter (ACH chapter, INV group).
If the entered quantity is less than the quantity remaining to invoice, a window is displayed to specify whether the line must be subject to a partial invoicing.
If the entered quantity is greater than the remaining quantity, a warning message is displayed.
When picking receipt lines, completely returned lines which cannot be invoiced (the invoiced quantity is empty) are not displayed by default. These lines can be displayed by affecting the value Yes to the PIHQTYRET - Returned quantity invoicing parameter (ACH chapter, INV group).