<pkg-contents spec="1.12"><f n="jenkins.war" o="root" g="admin" p="33188" pt="/path/to/jenkins.war" m="false" t="file"/></pkg-contents>
<pkg-contents spec="1.12"><f n="jenkins.war" o="root" g="admin" p="33188" pt="/path/to/jenkins.war" m="false" t="file"><mod>group</mod><mod>owner</mod></f></pkg-contents>
Remove the 'option' of specifying the install location
Remove the 'option' of specifying the install location

THe installer will say everything is invalid