How to get last 12 months data in report

Hi All,

I have a requirement to show last 12 months data in the report basing on the system date. I know that we can do I_STEP =1, but can anyone give me a psuodo code so that it can be really helpful. I also tried offsetting but it is not catering the requirement..

If user executes report today, the report should be as follows.

                      Stock in transit           Blocked stock

jan 2014           1000                             2000

feb   2014           4000                             2000

mar 2014           30000                             5000

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Jan 2015         9000                                   7000

Thanks,

Karthik