DB2 does support IN. However, it would appear from the error that your query is returning an empty string for the "INT(REPLACE(LOWES.T572_SHP_LCT_GRP.T162_CGY_SHT_NME,'DC','')". (In fact, if you copied the query into your question exactly as it appears, then you are missing a closing ')'. So that would mean you are trying to check a string against a list of integers, because the INT function is not completing. Please confirm this.) You should probably add:
REPLACE(LOWES.T572_SHP_LCT_GRP.T162_CGY_SHT_NME,'DC','') <> '' AND
ahead of the "INT(...) IN (...)" part of the WHERE clause. This would make sure no empty strings are not being used with IN.
