Hi Gopinath,
In J1IF01 it will always pick the value of Subcontracting component from J1ID-Assessable value.
Subcontracting Challan take the value of materials from Assessable value maintained in Excise masters.
What you are giving inside a subcontracting PO is not the value of any component but the conversion charges for the Finish product.
The logic behind this is Excise needs to be calculated on Assessable value. But you have an exception of Excise duty if the components are consumed fully before 180 days. If it crosses 180 days this Assessable value is the base for payment of Taxes.
Regards
Binoy