BPC 10 MS - SELECT statement

hello,

I am trying to filter dimension members using SELECT statement..I am trying to get ent2 list  where ID'S NOT IN ENT1  list.

my second select returns incorrect list. can we use "not in " in select in BPC?

*SELECT(%ENT1%,"ID","ENTITY","PARENTH3='ENT600'")

*SELECT(%ENT2%,"SOURCE_ENT","ENTITY","SOURCE_ENT<>'' AND SOURCE_ENT NOTIN (%ENT1%)")

Thanks in advance.