When I generate reports for multiple data files in Openlab CDS Chemstation at times the header will change the date and time of the "method last changed" field. I'm not sure why this is. I believe it is because I am changing to an updated report format I created to make the data more readable. In my effort to anticipate possible criticisms from the state, I'm afraid a regulatory agency will look at my data, notice the change in the date and time then ask me to demonstrate that the change was not due to altering the calibration. I guess what I'm wondering is how I can like the master/ sequence method to a different report format.