Retroo SIS Updation

Hi Everyone,

I have issue i need to develope new info structure for some Sales data this i can do but when execute this report i get results only from the time when i have genertaed the Info structure but my requirement is that i need to have the data of the pas history also that mean info structure needs to produce the data before the date of creation also.

Example:

If i create new infor structure and update on 28/11/11, i get data from 28/11/11 but system have transactions from 01/05/05 how i can get the data from 01/05/05 ????

thanks in advance .