If you use the conversion factor to create an attribute using a different Unit of Measure for your PI Point, you can specify the source Unit of Measure in the PI Point configuration.
Or if there is another purpose? Totalizing? Please provide a bit more information on what you need to achieve.
The response of Jose is pointing in a better direction. The use of SMT of course points to PI Points being the probable area to look.
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The conversion factor depends on the interface/application that is writing to the PI Tag (where the raw data is coming from).
Some interfaces can use the conversion attribute while others don't support it. The most common use of the conversion attribute is for totalizers to switch between units of seconds to hours or days.
Check your interface manual to see if your specific interface supports it. There should be a section in the interface manual that will describe it's function.