Field help (WCLEFLG) 

This information specifies if the receipt has been closed from the point of view of the invoicing. No invoice is pending for the receipt. The goods without invoices are considered as free and not valued.

For an intercompany receipt linked to a nonbillable sales delivery, the receipt is automatically considered as Closed.
SEEINFOAs there can be multiple and legitimate overcharges, some lines cannot be invoiced and are considered as completed from an invoicing point of view. In this case, click Completion from the Actions icon available on the line to close or reopen receipt lines not linked to an invoice, but completed from an invoicing point of view. These lines may therefore be overpriced if required.