>>>>>According to the description of the case I got, the stored procedure generated just a single row with 0 in quantity and in the sum_cost columns.
>>>>
>>>>OK, that's a bit clearer now. So the data into the report is a one row cursor with zero in both columns but the report is showing a value greater than 0 for one of the columns. Is that right?
>>>
>>>Yes.
>>
>>Any calculations on the report field? If you add in another field and set its value to the same as the field showing the incorrect value, what happens?
>>
>>If the value is from a variable, check if the variable depends on some other variable. Make sure there is no funny calculation on the variable.
>>
>>That's all I can think of at the moment
>
>The problem is that it is an application and I can not create a separate version to debug this problem (I think). The variable is not dependent on anything else, it's a simple variable. See attached.

Is sum_cost the field in the cursor?

How are you expected to fix the report if you can't make changes to it? All I suggested was to drop a new field on the report with the value set to the name of the column.