standard cost error..

Hi Friends

We have a material with diffrent valuation type per say MFG and procurment etc. During standard costing I found that standard cost is updated only at header level not at child material level, which cause of a loss of the difference cost.

Stock value is based on the individual valuation type i.e. is correct. But the problem in valuation type -MFG which having price control "S" having rate which was uploaded at the beginning of the SAP live . Now the standard cost of material has increased The stock which we are having in plant, evaluated at lower rate where it is consuming all raw materials at inflated/higher price. Why does its happening?

Please help us in solving this.