How to define Transfer price with multiple Financial routes (A --> B --> C)

Summary:

How to define Transfer price with multiple Financial routes (A --> B --> C) - need to define Transfer price at C = y% of transfer price cost at B

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Costing experts : Looking for pointers on how to configure 2 level markup in Supply chain financial orchestration flow.

Requirement : Cost in BU1 (10) --> BU2 (5% of BU1 = 10.5) --> BU3 (10% of BU2 = 11.55) .

Issue : Only based on Transfer price rule if I set the system up then TP on BU3 is (calculated as 10% of Cost in BU1 = 11 ) which is Not as per client ask.

How can this be modeled.