Why does new 23D New Supply Request Page generates GOP error?

Summary:

New 23D feature of New Supply Request Page generates GOP error "Invalid combination of time and destination organization."

Content (please ensure you mask any confidential information):

Customer is testing the new 23D feature of New Supply Request Page. Once this page is enabled and when going to this new page to create a Supply Request, it generates error indicating:

A valid supply source could not be retreived from Global Order Promising. GOP returned the following error message: Invalid combination of time and destination organization.

The same error does not show up if/when using the old classic Supply Request page.