How to define attributes at view object level ?

Hi,
I am defining one attribute at view level and also i am declare a bind variable.
eg: attribute name:days Bind variable: :Enter_The_Days
and In the days attribute-->(scheduledshippeddate-requestdate)
and In the where condition Days>:Enter_The_Days
But at the time of running the application module,It returns error. Can you please help me on tha.

It returns errorWhat error does it return?
John

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    Thanks

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