How do I force rows added from a slice to con...

[Steven_Coile]

How do I force rows added from a slice to conform to the slice selection criteria? For instance, if the slice only includes rows for customer A, how do I automatically set the customer to A for rows added from the slice? One way would be to only allow a new row if the customer is already present in the slice, but I’d like a method that works with an empty slice.