Play at the plate

[NewNCref]

Hey guys (and gals),

As I've said before, I'm new to softball officiating, and so I have a question which may seem basic to most of you guys, but I'd appreciate any help.

Ball thrown from F6 to F2 with runner R1 rounding third and coming home. F2 makes catch at the plate, and R1 jumps outside the base path to avoid the tag. I call R1 out for jumping outside the base path. No questions from either team. After the game, I was talking to my partner, who said that a player cannot be called out for going outside the baseline on a play at the plate. Is this true? Is this the same in all ball (SP, FP, and baseball)?

Thanks,
Quinn