How to resolve Sales Order Posting Error "You must enter a value in Gen. Prod. Posting Group for Line No. 40000 if you want to post discounts for that line".

The error indicates that for line 40000 on the sales order, the system is trying to post a discount and therefore requires a value in the “Gen. Prod. Posting Group” field for that line’s G/L account or item. Even if there is no explicit discount line, invoice or line discounts can still be calculated.

To resolve this, ensure that the G/L account or item used on line 40000 has a valid “Gen. Prod. Posting Group” set up so discounts can be posted. If discounts should never be posted for that line, adjust the setup so that discount posting does not apply to that line type, or remove any implicit discount configuration affecting that line.

References:

• You cannot add an invoice line to buy a fixed asset when the acquisition cost account is set to a general ledger account that does not have the "Gen. Product Posting Group" value populated in the North American version of Microsoft Dynamics NAV 2009