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Blue JayI would write "The Promise Date is used to measure on-time delivery, and does not change once the order is booked unless there is a change to the customer contract."Why would you place the comma before and? I don't believe the phrase "does not change once the order is booked unless there is a change to the customer contract" cannot stand alone
Aspara GusNo comma.Are you saying the comma is wrong and should be omitted, or are you saying the comma is optional and you would prefer to omit it?
Blue JayAre you saying the comma is wrong and should be omittedYes.