Before revision:  Initial margin funding charge enters the PDE's delta term as a cost, irrespective of being a long or short position, effectively a tax that cannot be transferred between two clearing members, or a bid-ask spread a market maker charges uncollateralized clients or fellow financial counterparties .
After revision:  For uncollateralized customer trades, MVA can be transferred to the customer via an extension of the liability-side pricing theory. For BCBS-IOSCO covered OTC derivatives, a market maker has to charge financial counterparties a bid-ask spread a market maker charges uncollateralized clients or fellow financial counterparties .