Does my link not work ? since it takes me to the correct page. Sorry if i'm wrong, don't know much about this. Also, thanks for the prompt reply....
The "?Parameter=Value" is for 1 parameter to the url, for two (or more) you use "?Parameter1=Value1&Parameter2=Value2". Since your link has 3 parameters (prio, q, caff), the first one should use the question mark '?', and the other two should use the ampersand '&'
Link will still take you to the correct page, but the third parameter won't have the correct value, thus no affiliate link for you :(