The form I'm referring to is a copy of SalesLineBackorderListPage, with a few filters added to it. It has two added display methods, both of which are one-line InventTable::(this.ItemId).[fieldname] retrievals.
I couldn't see if SalesLineBackOrderListPage includes any cached methods, as it has a few display methods built in. (This had also occurred to me.)
I have only ever cached methods in X++ code where the tables were multiple data sources, linked together by X++ code themselves. How do you do this when the data source is a query?
Thanks for your help so far, hopefully there is something obvious I am missing :)