alosso: It hasn't been named "one ball rule" by the company until Pizza did so, late in his stay.
No...We players have known and cited the "one ball rule", long before Pizza was moderating the forums.
In the rules of Golf book, it is called the one ball rule, that can be adopted buy whom see fits.
I think most PGA Tourneys use this rule...I/e I recall some golfer before the start of a Major many years ago, complaining that not all his playing balls had arrived, and he was one short-had something to do with the number on the ball.
Point is, the one ball rule, is a rule...when adopted for play.
Edit:
Just to add from the USGA site:
Rule Misc.
One Ball Condition
Q.What does the "One Ball Condition" mean?
A.The Rules of Golf do not require a player to use the same brand and type of golf ball throughout the stipulated round. A player may use a different ball to start each hole. However, the Committee may adopt as a Condition of a Competition, the "One Ball Condition." When this condition is adopted, players are required to use the same brand and type of golf ball throughout the stipulated round. Please refer to Appendix 1; Part C; 1 (Specification of the Ball).
Seems it's called "condition", not "rule"...semantics, especially since it under 'Rules Misc"...lol