Logging question - referer logging not working when done in addition to separate access_log

["Rose, John B" <jbrose@xxxxxxx>]

Apache 2.2

We are attempting to set up a referer_log file. But when we add a CustomLog line specifically for the referer log it will not log,  if our CustomLog line for our access_log is there. 

If we comment out the CustomLog line for access_log, then the CustomLog line for the referer_log logs correctly. 

We also just removed the "env=!image-request", it still did not work

Can you tell us what we are doing wrong?  Httpd.conf code here …

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined

LogFormat "%h %l %u %t \"%r\" %>s %b" common

LogFormat "%{Referer}i -> %U" referer

LogFormat "%{User-agent}i" agent

…

   SetEnvIf Request_URI "\.(jpg)|(gif)|(png)|(css)|(js)$" onlylog

   SetEnvIf Request_URI "\.(jpg)|(gif)|(png)$" image-request

   CustomLog /apache/logs/access_log combined env=!image-request

   CustomLog /apache/logs/referer_log referer env=onlylog

Thanks