By applying forecaster changes, forecaster compensating changes, and crude changes, the original DOP of the participants has been amended to bring their fixed grades, process stock, and crude run equal to the actual production of fixed grades, process stocks, and crude. These amended DOPs of the participants are called retrospective DOPs, or retro DOPs, which are combined to make a refinery retro DOP.

Note that, in the refinery retro DOP,

• All fixed grade and process stock production equals their actual refinery production.

• The total crude run in the retro DOP equals the actual crude run.

• The delta between the actual production and retro DOP of the refinery remains on balancing grades.

• The delta between the actual production and retro DOP of the refinery remains on losses.

The retrospective DOP is used for the allocation of balancing grades and actual refinery losses.