This is probably not what you are looking for, but I am not sure you can do what you are trying to do. The only way I have been able to do what you want is to publish the report in Word and then use an unbound object frame to display the word document. My guess is that the data in the report is related to the data in the main form (???). I guess you could put some code on the on current event of the main (parent) form that would run the report and output the document to word and then display it in the subform. It will be really slow but it should work. You could also try to recreate the report in a form and then display it as a subform that. Maybe someone else knows a better way, I hope!
GumbyD