Message SAP VT817 - For delivery-related billing, the field 'Quantity pos/neg' must be '+'.

Cause for delivery-related billing, you must enter pos/neg '+' inthe copying control in the Quantity pos/neg field, in order thatthe document is updated correctly. Example: Delivery (dely) to billingdocument (F2): At item level, you must enter '+' in the Quantitypos/neg field (field name PLMIN). &SYSTEM_RESPONSE& &WHAT_TO_DO&Procedure for System Administration