Feedback on Merge Replication Error

dear all,
regarding the problem of not uploading the data from the
subscriber to the publisher though the merge agent is
successfult and the status is no data needed to be merged.
i checked the record in msmerge_contents , it doesn't
exist.
actually i checked with the table nick name and the
rowguid of the row i made modification in.
any help with that?
Thanks
Dalia,
does the trigger exist on the subscriber? If not then perhaps the exchange
type is incorrect.
Regards,
Paul Ibison