ERROR BRAIN (416): InfoObject ?? is used in both structures of the query

Hi Experts

I am trying to modify a complex Query with rows of many RKFs/CKFs. Currently report filter is restricted on value type=10.

I need to modify it to add a column restricted to value type 10 and a second column resttriced to value type=20 plus a column of variance. I have removed the report filter and added a structure with 2 selections, 1 restricted to value type 10, 2nd restricted to value type 20. I am getting the error 416. I tried doing this with reference cells but got same error.

Any suggestions appreciated.

Thanks !