Can I define a Function as part of the Report?

In an Oracle Report, I want to define a Function, to use in the report query. I defined a Function CALC_DIFFERENCE under Program Units. It compiled OK.
But when I tried to use this function in the query it get them message ORA-00904 “CALC_DIFFERENCE” invalid identifier.
Can I define a Function as part of the Report? Or does it need to be on the database?
Report Builder 9.0.4.0.33
Thanks

You have to put it in the database if you want to use it in your query. The reason is simple: the query runs in the database, so it won't see the function in the Report.
If you really need the function in the report (because it uses other values only known in the report), you have to create a formula column.

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Can I define a Function as part of the Report?

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