Get the negative value with currency

Hello, I am in a report(rdlc).
Now the question is I set a value with currency format in a Field.

The query is making the money as a negative value.

But the displaying result is always positive.
If I set the field format as numeric, the negative result will be shown.


Why?

Thanks

i don't know rdlc, but to get help around here you need to post code.