Model Not getting Triggered in Wm6.1

i have designed a model(in modeler) and generated it,i have updated that model for monitoring.
That model is like… its triggered when a doc is published

now what happened is even when i publish the corresponding document that model is not getting triggered.

i’m unable to see that model in WmMonitor

what are all may be the reasons for the models not to enable properly…

when we update a model for monitoring it shuold automatically enable
but here what happened is i manulally enable it by making chnages in the following PRT tables–PRTMODELINFO and WMProcessDefinition

plz help me in this,its an urgent thing for me to do