sales order

In sales order line item billing tab there is a check box called SUBCINVPROCESS

1.what is the use of it and

2.where in customer master we maintain this.

Help F1 says :

Manual invoice maintenance

Indicates if the invoices for manual post processing should be printed out.

<b>Procedure

The system proposes the value from the customer master record. You can change the indicator manually in the sales document</b>