ASCP ECC Plan Dates for Planned Orders

Hi All,

We are evaluating ECC plan run.

Key constraint we want to model are -

1: Critical Resources

2: Purchasing Lead Time

3: Only 1 supplier capacity

However we noticed that for the few items consistently the Planned Orders are created way early than required.

Is there any pointer on how can I investigate the root cause for this?

I am comparing Need By Date Vs Sugg Due Date.

As per my understanding Need By Date for Planned Order is derived from earliest demand the order is pegged to and Sugg Due Date is earliest possible Completion or Receipt possible.

Difference between these 2 dates is how early or late the supply is.