scheduling agreement subcontracting PO not picking changed BOM value during

Hi All,

We have created a scheduling agreement for subcontracting PO .Initially we have maintained schedule lines with respect to ratio of inward to outward material 1NO=0.048KG respectively . We have done some goods receipt with this ratio .Now we have changed the ratio to 1NO=0.024 KG . But while trying to do goods receipt the ratio is showing as 1NO =0.048KG .

I want to know why the system is not taking the new BOM value during goods receipt .

Regards

Abhijit Das