Hi Russell,

guess an "after insert" business rule on [sc_request] should be fine?

Conditions could be something like " current.parent.sys_class_name=='incident' " - so this would only run if the inserted request has an incident referenced in the parent field. 

Within the BR you can get the INC record via "current.parent" and do with it whatever you need to.

I have built something similar a while ago and it worked just fine.

Cheers!

Martin