BMXAA9071W Only the first {0} records can be sorted for the {1} attribute. Filter the list to show less than {0} results in order to achieve a sort based on the {1} attribute.

Explanation

The attribute that you want to sort is a non-persistent field so in-memory sorting is required. The number of records that can be sorted in-memory is limited to the fetch limit for this type of object or 5000, whichever is smaller.