水晶报表 where 子句中嵌套select子句
我在写水晶报表的where 语句时, 包含一下内容
{action_lib.CASE_TYPE}={?Pm-action_lib.CASE_TYPE??01} and
{action_lib.ACTN_CALENDAR_TAG} = {?Pm-action_lib.actn_calendar_tag} and
{action_lib.ACTN_START_DATE} <= CurrentDate and
{action_lib.ACTN_END_DATE} >= CurrentDate and
(IsNull ({action_lib.ACTN_INTERNAL}) or {action_lib.ACTN_INTERNAL} = "N") and
{action_lib.actn_version_no} in ( SELECT Maximum({a2.actn_version_no}) FROM a2 WHERE {a2.case_type}= {ACTION_LIB.case_type}
好像在where 子句中嵌套select子句总不成功,有何方法可以解决吗?