Reporting a simultaneous foul

[Sharpshooternes]

I understand that this is a very rare occurence and no matter what you do, no one will know whether you do it wrong or not. However I am seeing that we are split down the middle: one reports, then the other; or get together and one official takes it to the table. That is all well and good and I could go either way, however no one has as yet gone to the attic to dust off their 1934 mechanics book to give us direction as to what the preferred way is? I haven't come across anything that gives any light. Is there someone out there that has a reference?