Buying same item from 2 suppliers, one supplier add costs percentage to item, how to manage?

ERPNext Buying
1

Hi there,

i’m fighting to configure ERPNext to following use case:

  1. Buying same Item from 2 different supplier (S1 and S2), both Suppliers are in Item Supplier
  2. S1 charge 5% costs for the item (both in Purchase Receipt and Purchase Invoice), S2 doesn’t add cost as it’s included in item price

How to set up correctly Item Costs to include 5% costs in valuation and total only for S1?

Thx