On 2-8-2012 22:45, lhorton wrote: Turns out this is a tad different. The notation above generates errors. So I added "()" to Application, which had the side effect of moving the conditions into those parentheses. After some more experimentation, I ended up with this: $p : Passport() $a : Application() The conditions are inserted into the first parentheses pair. Next adding a CONDITION column on "application" resulted in the following: $p : Passport( application == $a ) $a : Application() However, $a is defined after $p, so $a cannot be referenced in $p yet; $a has to move to the front, but that will put the conditions back in $a. So I tried a little smoke screen to hide the parentheses of $a: $a : Application(1==1) $p : Passport() That worked, but is not very pretty. Maybe it is an idea to use an optional placeholder for where the conditions are to be inserted: $a : Application() $p : Passport(<insert_conditions_here>) Thanks for the boot, Tom