oscam cache ex help

[scubidoo]

hi all

using oscam cache ex mode 3 and it work fine

but i have one question.

I have try whit a friend exchange only cache.

I have choose a channel from a provider i don't have.
he have choose the same channel and decode fine.
but I can decode the channel from cache because the oscam says no matching reader.

do I have a list one reader from this provider to read the cache? I was thinking if I have on cache I must decode the same channel.

thanks for help