Contract Lines - Billing Amount Details tab: Billing Amount does not equal Unit Billing

Hello,

Per PeopleBooks, Billing Amount field is updated whenever changes are made on the Billing Allocation page.  Unit Billing is only calculated during contract activation.  After contract activation, this amount is not updated by the Billing Allocation page, or any other process, it seems.  Similar situation for the Revenue Amount and Unit Revenue fields on the Revenue Amount Details tab.

Question: Is this correct?  Or, should these amount field be brought in sync when an amendment is processed?  If yes, Is there an automated process to do so?  If yes, what is it?  Or, is IT involvement required to manually update the unit amount?  Are there other locations where this value must be updated, if updated manually?