Functionality for marking whether or not an Estimated Time of Arrival has been provided to either the bill-to or ship-to via Order Management and Order Creation. 

On the main grid of Order Management a user is able to specify if an ETA has been provided to either the bill-to or the ship-to or both.

On order creation, a user is able to specify if an ETA has been provided to either the bill-to or the ship-to or both.

This way, if you need to re-schedule the order, you know whether an ETA has already been provided.