Is this travelling?
 

I don't have great access to a rulebook, so I'll ask here.

Last night a player was on one knee and picked up the ball while on one knee. He then stood up. I whistled for a walking violation, and there were no complaints.

Was that correct?

This is a traveling violation.

Walking violation...not sure what that is...

Traveling violation...yes, correct.

From the Forum's Misunderstood Rules List.....
 

5) The traveling rule is one of the most misunderstood rules in basketball. To start a dribble, the ball must be released before the pivot foot is lifted. On a pass or a shot, the pivot foot may be lifted, but may not return to the floor before the ball is released. A player may slide on the floor while trying to secure a loose ball until that player’s momentum stops. At that point that player cannot attempt to get up or rollover. A player securing a ball while on the floor cannot attempt to stand up unless that player starts a dribble. A player in this situation may also pass, shoot, or call a timeout. If the player is flat on his or her back, that player may sit up without violating.

Case Book situation 4.44.5D. You got it correct.

4.44.5 SITUATION D: A1 secures possession of the ball with one knee in contact with the floor. May A1 assume a standing position without committing a traveling violation? RULING: It depends on what A1 does. If A1 attempts to stand up while holding the ball, a traveling violation occurs. However, if A1 starts a dribble and then rises, no violation has occurred. Also, A1 could pass, try for goal or call a time-out from that position.

OHBBREF is going to get mad at you guys for posting rules and case book plays.