Order Management - Promised Date Backup

HI All,

I need some help to take the backup of Promised Date in Order Management. We have few metrics that need the 'Original Promised Date'.

It is possible that after the discussion with customer we may give a new promised date to the customer. However we need backup of original promised date.

Is there any standard field in Oracle Order Management that copy the Promised Date field and takes backup of 'Original Promised Date'?

Any pointer on this is much appreciated.

Thanks