When using filters on a user-defined datalist, a user may receive error: 'Unable to load datalist. Conversion failed when converting from a character string to uniqueidentifier'. The specific filters used in the datalist causing this issue are Interaction Category and Interaction Subcategory.
We are currently evaluating this issue and will update this article when we have more information.
Workaround: Do not mark Subcategory or Category as filters.