Hello Mugesh
SOP is basically a forecasting and planning tool.If you are not using forecasting then you can directly enter PIRs in MD61.Active version 00 is used in the PIR table for maintaining the independent requirements for a material.Inactive versions are used in LTP for generating simulated planned orders.If you want to run MRP then go for the active version which which you can select as default in user settings of MD61 so that all your PIRs will be under active versions only.I dont think there is any other step involved if you are directly entering PIR.
Reward points if helpful.
Thanks & Regards
Bibhu