A TOUGH PROBLEM ON Prompts

Hi all,

I have faced a small problem in defining a prompts in Web Intelligence, Well my Q. is I have a requirement of creating prompt in Web Intelligence as I have to create two prompts let P1,P2 .

Where P1 is Conditional prompt for month & Year and P2 is also a prompt on month & Year , but the month in P2 is fixed and the Year is to take it's value from P1... And the end- user is allowed to enter the value for P1.. I am using SAP BO 3.1 Thanks in Advance.....