From 16.4.2, Clarity provides the ability to add Financial Grouping Attributes in Cost Plan and Budget Plan.
Below are the eligibility criteria
An attribute created under Resource Object using a dynamic lookup which is object based is still NOT showing up under Administration - Attributes - Financial Grouping Attributes
16.4.2
The dynamic lookup query should have LAST_UPDATED_DATE in the SELECT clause of the query which is object based.
Include the LAST_UPDATED_DATE in the SELECT clause of the lookup query.