Extend APIs by field with transaction ID that last updated the record

See picture. For uploading projects to GitLab from within Excel we need to do some locking. Typically this is done by optimistic locking: let’s check straight before uploading the change to the API whether the row has changed. That can be done by comparing all fields but that can have some side-effects and cause some changes to go unnoticed (because there are some backing data that is not visible through the API).
It would be helpful when you could more easily see that a business object in the API has changed by comparing the transaction number of the business object with the transaction number seen when the data was downloaded into Excel.