Trouble adding an uncredited credit to Sol Madrid (1968)

@Bethanny

I tried to add an uncredited credit to Sol Madrid in contribution #250109-170138-744000 but IMDb rejected it.

The uncredited person is Vince De Rosa musician: french horn

Here is the photo and reliable link of where I've found it.

https://www.filmscoremonthly.com/cds/score.cfm?SCID=103