One of the things that I just learned while trouble-shooting a reporting problem: Do not disable the Start Date or End Date slip entry features.
In a previous article, I mentioned how you could disable program features that you no longer use. If you insist on disabling one of the date fields, choose the Start Date, not the End Date. One of the problems occurs when people set up their Preferences to Copy Dates. If you disable one of the date fields, it does not remove it from the program. It still contains data, you just can't see it. Therein lies the problem. Just by disabling the Start or End date does not prevent different dates in each of the fields. If you have a reporting problem, you can't check the Start and End dates of slips in question, simply because one or the other is not visible.
Users may not like the tedium of entering dates in both fields, however, here is a short cut: Enter the slip date in the Start Date field, press tab and type S in the End Date field. Your Start Date will be copied to the End Date field with a simple keystroke.