Film Outdoor curve for P45

The Film Outdoor curve does not appear in C1 when looking at a P45 image. I read elsewhere that Film Outdoor only applies to certain backs but the manual doesn't say this and the other post didn't indicate which backs it applied to.

Based on the description of this in the user manual, it looks like it would be useful for some of the P45 images I'm looking at. Any reason why it doesn't apply to the P45?