Oh I've got it! Thank you so much! When I clicked into it it said the relationship between the two tables was invalid.. and I realised I had forgotten to remove the AND Products::height = Sizes::height AND Products::width = Sizes::width.
Your help is very much appreciated.
Can you tell me, if I wanted to have a size override, how would I do that? What I mean is that the user could choose a size from the sizes table, or else they could select, say, Custom Size, and if they selected that, then on the products layout they could enter a height and width that would be stored in the products table. And if they selected any other size, then the size would be copied from the sized table into the products table. So that the products table always contains the correct height and width, but the sizes table is just used to look up common sizes at the time of entry. Does that make sense? How would you do that?
Thanks!
Asphyxia