Distribution Key (GLEI) for Co-Product Process Order

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Hi Gurus,

Another one that I cant seem to figure out.

In ECC we have a BOM/Recipe/Version created where there is a primary material produced and in addition a Co-Prouduct. This Process Order runs for a month with Daily Receipts (GLEI is assigned).
In ECC when I look at Stock Requirements (MD04) for Header Material A and Co-Product Material B, I see what I want to see. ie. for each day of the month I see a daily receipt planned against the Procvess Order. When I look in APO /SAPAPO/RRP3 in the ATP tab, for the header material I see the same daily receipts, but for the co-product, I do not see the daily split. Only the entire Planned amount on the last day of the month. This is casuing issues for ATP checks for this co-product since it does not reflect the daily availability of the material.

Any hints???