How to select validation template of type API for a newly defined record set in Processing Constrain

Hi All,

We have a business need to restrict user from updating "Intermediate Ship To" on the sales order line when orders is Released to Warehouse in a WMS enabled org. Since "Intermediate Ship to Org" is not available as part of the seeded Order line attributes in Processing Constraint, we have defined a new record set with Entity Order Line and column "Intermediate Ship To Org". In the Processing Constraint for Order Line, we are selecting "Update" Not Allowed and in the Conditions when we select Validation Entity as Order Line and Record set as the newly defined record set, we