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The price for the negative quantity is defined by the invoice price.
Note: IMOS reporting is based on bunker liftings (end price) and not on bunker requirements (planned price). In order to see a specific price reported in the Voyage Bunkers view, you will need to change the price in your bunker liftings. Bunker requirement communicates request information from the Operator to the Bunker Manager and it's not used in P&L.