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Query contains incompatible objects WIS 00008

I have two derived tables in a universe--they are derived so I can create a key to link to a date dimension and a time dimension. Both tables use this logic:

select  to_number(TO_CHAR(Timestamp, 'yyyymmdd')) as date_key,

((Timestamp - TO_DATE(TO_CHAR(Timestamp, 'yyyymmdd'),'yyyymmdd')) * 86400) + 1 as time_key,


from Table1

date_key links to date_key in d_date table. time_key links to time_key in d_time.

In Web Intelligence if I drag and drop a field from Table1 on the "SQL" button or "Run Query" it is fine, but if I drag a field from d_date or d_time I get the error "the query cannot run, because it contains incompatible objects. See you Business Objects adminstrator. (Error: WIS 00008).

"date_key" and "time_key" are datatype "NUMBER" in an Oracle database.  The Universe connects using JDBC. I can run queries fine in a query tool using the derived tables linking to the dimensions.


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