Self-Assessed Tax value not being represented on Inventory Item Value

We are having some issues with Self-Assessed Tax not being represented in the Inventory Item Value.

Currently a Self-Assessed Tax Liability is being created and paid. It is being paid by a manual process through our Tax Department, therefore it has not relationship with an Invoice within Oracle or the Item that the Self-Assessed Tax relates to. The value after it is paid does not make it back to Item Value in the Storeroom. So currently the Item Value is being represented at the Item Value only, with no tax (only for items incurring Self-Assessed Tax on the Invoices). Then on my Inventory Reconciliation, my Invoice Price Variance GL Account has a growing balance, which the