Substitute Billing Date in Invoice with Planned Delivery Date from the DD

Hi all,

I understand that the current behavior of the system copies the billing date from the PGI. However we want to change that to:

Substitute Billing Date in Invoice with Planned Delivery Date from the Delivery Document.

We will need to create a new user exit for this change.

What is the most effective way to communicate this change in a FDS document?

Cheers~