Text Replacement Path Variable in Query Title

Hi,

I have a query with title "Customer Sales".

I have a Z info object (Char) (It is not used in any data targets) it is used to maintain a date manually.(Only one entry)

For example as of now Z Info object has 15.01.2014

How can i update my query title Customer Sales on 15.01.2014 (Customer Sales on + date in the z info object) (If the date field is blank them (Customer Sales on Current Date)

Please advise how to write a user exit...an pseudo code is greatly helpful.

Thanks