Updating invoices

we are posting a backlog of invoices now when updating some invoices are bring this message

" you must specify Gen. Prod. Posting Group in sales line…)

how do i resolve this because the invoice cant update

Welcome to DUG!!!

Are you selecting apart from Item on Invoices I mean what is value in Type Field

You need to bring the Gen.Prod Posting group field on Form and then ask user to select the appropriate the same

The message is showing because It is not set on master may be on Item/G/LAccount etc.

Check the masters.