How do I get the A/R invoice explanation/remark field to display the SO description 1 field?

We just upgraded from 8.12 to 9.2.  In 8.12, when I ran sales update and the IB batch was created, the explanation/remark field on the G/L distribution screen was Description 1 from the SO.  Now, in 9.2, it's populating the item master description (which is useless because it's a generic description in the item master).  Anyone know how to get SO description 1 to populate the invoice explanation/remark field again?  I'm hoping I won't have to change this field on the invoice every single time.

I did see the branch/plant constants are set to item master description for journal entries, but 8.12 was also setup that way and we were still getting the SO description, not the item master description (it does populate the item master description for PO related journal entries, though).  Maybe that was some type of customization we had in 8.12?  Any help would be greatly appreciated, thanks!