Commodity Fraction?

[John K. Taber]

One of the fields involved in defining an investment in the Commodity
Editor is "Fraction."

I'm baffled what to enter, and the purpose of this field.

Suppose I'm trying to enter 25 bond notes of 1,000 dollars each. What
should be entered? The default is 1/10000.

Would somebody be kind enough to illustrate Fraction with several kinds
of securities?

For common stock, the context help says 1/1, but I'm still puzzled as to
purpose of this fraction.

BTW, I notice that "type" does not include bonds of any kind. Any way
around this? 

John