MSI tollerance absorb to Inventory Part Unit Cost

Hello,

I’m looking for a support to clarify why Inventory Unit Cost does not change if tolerance applied for MSI Posting line for PO chargers. 

Please advise is there any data setup to be completed also. Our requirement is to absorb tolerance to the Inventory Cost. 

The scenario is the company uses “Transaction Based” Supplier Invoice consideration for all Inventory Parts. The PO lines and PO Chargers Lines are getting absorbs to Inventory Part through M189.

But issue is when tolerance option enables from Company and Supplier level, if a tolerance applied to MSI the tolerance posting does not apply to the Inventory Unit Cost. 

Here is an example; PO Chargers is 50. When creating MSI used 60 for Invoice line (this is the amount needs to pay). Since tolerance is unable for this Supplier, two Posting Lines created as 50 and 10 for tolerance. But 10 was not absorb to the Unit Cost. 

reference 1: Inventory Part for Supplier Invoice Consideration 

reference 2: Purchase Order Charge Line

reference 3: Inventory Transaction History after the Receipt

 reference 4: MSI SS