Co Product Cost Allocation

i am going to produce meet part from a carcass. i have mapped all data according to requirement

I have selected TCA at formula version in co products as40 and 60 respectivley accordingly as you can see in screenshort

But when i RAF it allocate cost by by 80 and 20 percent . can any one suggest why AX has this behavior

If you use TCA the percentages are allocated automatically based upon the costs of the consumed quantity and the RAF figures. Cost allocation percent as a field is only used if the cost allocation is set to manual.