Replication Stopping (foreign key issue)

[Jesse]

Replication has come to a halt on my slave machine because of a foreign key 
constraint issue.  It was attempting to add a child record for a parent 
record that is not present.  After checking it, starting with that 
particular missing parent record, there are no more below that area.  My 
question is this.  If it's present on the master, why wouldn't it be present 
on the slave before the child record would have been added?  I did not 
receive such an error on the master server??  I could probably add the 
missing master record, but the problem is that this will occur again.  It's 
happened about 3 times now. Does anyone have any suggestions?

Thanks,
Jesse