Form: using more than one attribute in page dimension

Hi. I have multiple custom attributes assigned to entities and I want to build a form with the entity dimension in the page. If I specify one attribute for the page, like AA_1, the form and the filter works. If I select more than one attribute (which the UI allows me to do and I can save with no error) like AA_1,BB_2 then the form does not open, saying a dimension is missing. I can use more than one attribute as an exclusion, like ILvl0Descendants(TotGeo) xAA_1,BB_2, and that works.

My guess from research is that the list is being treated as an intersect or an AND, not an OR. This is different than listing specific members which are treated as ORs and added to the POV dropdown. I can enter OR between the attributes, but when I save, I get an error. The form works, but the attributes are converted to the current entities that match. The attribute reference is replaced, so any new entities will not be included.