Attempted this but the combo box is showing duplicate list items. It is returning the field value for each row within the datagrid.
BAQ field setup:
App Studio combox box setup:
Otherwise, I’ve found creating a static list using this method to match the BAQ field list works, but that doesn’t seem like the right solution. 
Kinetic Static List Combo Box - Kinetic 202X - Epicor User Help Forum (epiusers.help)