Problem with input parameters not used

Hi everyone,

I have the following problem, i have two input parameter wich are derived from tables, all of them depends on another field. for example, i

have a table with date, last day of month and first day of previous month. i want to get only the last two values but they are depend on the field date.

The thing is in the filter expression im not using $$IP_FECHA$$ so the prompt to write this value is not appear. filter expression is this:

("ZFECHEFEBAJ" >='$$IP_LDPY$$' AND "ZFECHEFEBAJ"<='$$IP_LDPM$$')

thanks