Need word document for grouping rule for a single customer

Summary:

In Receivable and Collections, For auto invoice need word document for grouping rule only for one customer

Content (please ensure you mask any confidential information):

Say for a customer XXXXXXX is required to receive only 1 invoice per delivery note. We have also tried to change the set up of this account so as to have only 1 invoice per delivery note but it seems not to work.

Ex : 3 SO = XXXXX268 + XXXXX351 + XXXXX289  - 1 DN = XXXXX115 - 3 invoices = XXXXX805 + XXXXX811 + XXXXX806

Can you please tell us how to change the set up for this account only so, we can meet the customer's expectations ?