[users@httpd] ProxyPass ! directive seems to have no effect

[Matthew Broadhead]

I am in the middle of migrating a server and my old virtual host config 
which worked fine was like this

|ProxyPass /images ! ProxyPass / ajp://domain.tld:8010/ nocanon |
It passes ok to Tomcat but the ! directive is being ignored. There are 
no errors thrown. What might be causing this?