Lobby Data Source using table alias

I have created an lobby element which shows me which sub contract valuations are certified but not paid. The issue I am having is it will not allow me to add an alias on the view and I am 99% sure you was able to do this.

For example, here is my definition and I want to add the alias ‘a’ so it knows in my select statement to use the sub_con_no and valuation_no from the subval_invoice_details view.

I am using ifs apps 10, update 15. 

Thank you