Compare two table fields on a Report: Greater than Field

[Alphons]

I want to see my projects which are over budget with: field Actual cost Greater that field Budget Cost.

However I cannot select the field Budget Cost from a list, instead I type it in a textbox, but that doesn't work and it creates a very strange syntax, see the upper highlighted line in the picture.

What syntax do i need to use for the Budget Cost?
Or is there something wrong with the report conditions?

Thanks for helping me,

Fons.

[Mark Manders · Accepted solution]

You need to use the technical name: budget_cost. It will show up then.

[Alphons]

Thank you, this works for projects.

For Demand, is there a different technical name for budget_cost, because on the Table: Demand [dmn_demand] this does not work.

Thank you.

[Mark Manders]

I checked on an OOB instance (on Washington), but there is no 'budget cost' on the demand table. The only 'budget' fields I have are 'capital_budget' and 'operational_budget'. You could check the technical name of the field you are trying to compare by looking at the XML of a demand record, or checking the dictionary. 
If you don't have access to those, ask one of the admins to validate the technical name of the field for you.

[Alphons]

Thank you Mark, I checked with our admins, the provided the technical name.
It appears to be custom field. 

Best Regards.