How to prevent from refreshing supply data as onhand, work order, purchase order, etc when rerunning

Summary

How to prevent from refreshing supply data as onhand, work order, purchase order, etc when rerunning S&OP plan?

Content

Dear all,

We have a requirement to revise forecast demand and rerun S&OP plan. However, we want  system to use the supply data at the time of first running S&OP plan. How to prevent from refreshing supply data as onhand, work order, purchase order, etc. when rerunning S&OP plan, system only regenerate production plan base on the latest forecast demand?

Hope to receive your response.

Thanks,

Jenny