Field help (POHNLCOD) 

Setup that is used to define, for this entry transaction, if the references for the original document (number and order line) must be :

hidden:

The fields do not appear in the entry screen but the values are assigned if the receipt arises from an order.

displayed:

The values are assigned to the fields and displayed if the receipt arises from an order picking These values are not modifiable.

entered:

The values are assigned to the fields and displayed if the receipt arises from an order picking These values can be entered directly without passing by the order picking.