Here my use case is explained.
"Purchase order" is created as follow: Item - X Rate $100 Qty 50 Supplier 'Foo' Order 23-12-2017 Delivery schedule : -> 20 qty at 25-12-2017 -> 30 qty at 30-12-2017
Note : Rate of item X updates daily bases, purchase user and supplier talk on telephone and finalize daily rate.
Now when 1st delivery is given at that time rate changes and set to $105, and while 2nd delivery rate changes and set to 99$. so Supplier sends invoice :
20 * $105 = $2,040 30 * $99 = $2,970 Total = $5,010
Here “purchase order” is created 50*$100 = $5000.
ERPNext does not allow to change rate in “purchase invoice”. Can anybody tell me to how to deal with this situation?