PFC：左边是树型列表，右边是DW，数据多，快点树型列表检索数据。出现错误....

PFC：左边是树型列表，右边是DW，数据九万多条，快速点击树型列表检索数据。出现错误错信息如下....

a database error was occurreel database error code:999
select error:only cancel command is allowed when the rows are pending.

环境是any where 6+PB7，请问那位大侠遇到过这类问题，急需解决方法。