source table for last acceptable promised date

Summary:

Unable to find details of last acceptable promised date (change from data) for PO schedule line .

Content

We have a requirement to present last acceptable promised date .

Once buyer change prom

ised date , system keep previous delivery date (change from data).

Buyer wants to review the Original delivery date for the schedule line .

Change Order history provides the details but I cant find it in table.

Pls advice,

Thanks,Sima