pcu_type_filter = Filter(PCUType.fields, pcu_type_filter)
sql += " AND (%s) %s" % pcu_type_filter.sql(api, "AND")
elif isinstance (pcu_type_filter, StringTypes):
pcu_type_filter = Filter(PCUType.fields, pcu_type_filter)
sql += " AND (%s) %s" % pcu_type_filter.sql(api, "AND")
elif isinstance (pcu_type_filter, StringTypes):