I prepared test models in Creo Parametric 2.0 M070. See attachment PTC_CONSTRAINT_SET.zip.
In both cases you can set assembly parameter POSITION to 1 or 2 and regenerate to see the effect.
podsestava1.asm ... relations are defined on component level
podsestava2.asm ... relations are defined on asssembly level
I am sorry I do not have enough free time. Please open assembly and investigate parameters and relations. It is not complicated action.