Firstly, thank you Edgar and Rahul for taking the time to answer my question.
Apologies guys I should have provided more information in my initial post.
Our parent company is also our supplier. We cut a purchase order, notify them of the purchase order and in turn they cut a sales order. My supplier (parent company) is stating if they update the "first date" column in their sales order (which would in turn populate a correct ETA date) we will lose the ability to track late shipments.
To answer your question Edgar I am referring to the sales document. It is my understanding my supplier is only modifying the "First Date". Are there several date field in a sales document we can use to 1. track original promise date 2. maintain accurate ETA?
From a "customer" standpoint I need to be able to view both dates so that I know when I can expect to actually receive product and if that product is/was late.
Thanks!