Formula Variables and their use

I have a scenario where I have a date selection using a variable.
I get from and to date defaulted to 1st day of the month and current date
Next, I created a formula variable to calculate the difference between these 2 dates.
I can't uses replacement path variable to calculate the difference becaue the dates are not part of the transaction data.
When ever I bring formual variable into a formual it gives an error
Terminate: Variable D1QDQC684JU76RD3FQ10GECZ9 (D1QDQC684JU76RD3FQ10GECZ9) does not exist or is incorrectly used D1QUMP50BGW24SQ9PQMZDSMD1 [A418(BRAIN)]
This error is not in the customer exit. This error happens in the query designer design phase during syntax checks.
Thanks for your help
Kartik

there was a problem in defining the variables, while u r opening your query, and if its getting terminated means, definition of the variable and its usage is wrong somewhere else.
Here is the step by step procedure for Formula variables:
http://www.sd-solutions.com/documents/SDS_BW_Replacement%20Path%20Variables.html

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