Formula Variables in 'Condition' Screen

Hi

I have 'Date1' as a characteristic. I want to apply for condition on this 'Date1' characterstic.

So i created a 'formula variable by using replacement path' for this 'Date1' characteristic . And i included this 'formula variable' in an NewFormula in Columns of Query Designer.

Then im trying to put 'Condition' on this New Formula . When i try to give the Formula Variable in the condition screen at bottom.

Then it says that the Formula Variable doesn't exists . Why it is like that

Cant we use the formula varaibles in condition screen (at bottom of condition screen). Please let me know

kumar