How is it possible to win a 147 title belt below the welterweight limit?

[Pancho V]

Ok let me rephrase my question... Why set a limit for the Welterweight belt of 155 for a belt that goes up to 157? Belts should not be won at a Catch Weight ... IMO

I would rephrase it like this.

How is it possible for Cotto to win the WBO WW belt @ 146 ?
Cotto (146) - Jennings(146.5) 2/21/09


How is it possible for Pac to win the WBO WW belt @ 144?
Pac (144) - Cotto(145) 11/14/09


Because WBO/WBC/IBF/WBA... says so.