Why Backlog management is not considering eligible PO due dates from supply plan for rescheduling

Summary:

In Backlog management, supply availability date is not getting picked up from the eligible supplies from the supply plan provided in the supplier schedule in backlog planning options, instead, backlog plan comes up with its own date
ATP Rule is set with Supply Chain Availability search with ITF set as TLT. Item's LT is 50 days, PO is there in unconstrained supply plan with due date on the 50th day. However, Backlog plan says item is available in the next 1 week and accordingly suggest modified schedule ship date recommendations.

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