Control when Showing the System Generated add Button when displaying the reference table

I have 2 tables Called Order Items, and Orders. The Order Items references the table Order Item and therefore have the references table created and show in the Order inline Form.


I was wondering if I could control when to show the add button depending on the order status as what ever expression I try affects all other entries and is not specific to the Order

Expression Used in the Order Item add function
LOOKUP([_THISROW].[Order ID], “Order”, “Order ID”, “Status”) = Pending
[Order ID].[Status] = Pending

I just yesterday addressed a similar question. Click through for my response: