HANA CASE expression in Filters in IDT

Hello!
We have some problems in IDT while universe design.Our universe is on SAP HANA.
We want to use something like CASE logic in filter. When we use expression like (CASE WHEN (A=B) then column1 ELSE column2
END) in SELECT statement of object everything works fine. But when we use expression like (CASE WHEN (A=B) then (column1<C) ELSE
(column2<D) END)) in WHERE statement of Filter there is an error like "symbol '<' is unrecognised".
How can we solve this? It seems other expression and functions dont help us. In Universes based on Oracle expression CASE works ok even in this
case.