No conversion found for KG to EA in J1IEX With Ref to

Hello,

We are creating the Subcontracting PO with ABC material is having the UOM is KG and Sending the child components to vendor that materials are in "EA".

We are sending the material with paid duty.... we are creating the outgoing excise invoice.

After that we are going to receive the goods. and receive the goods with no excise entry... with ref to material document we are going to capture excise . here we are getting the error"No conversion found for KG to EA"

I have checked in material master additional tab here we are mainatined the EA and KG as convesrion