>Do all 3 records have the same value for the ID field? If not, what does your data look like? FWIW, I also would leave out the ID field from the UpdatableFieldList and UpdateNameList properties [if it is a PK field]. The PK field should not be updated.
>

All key fields must be listed in UpdateNameList property, otherwise automatic update won't work.

Thanks,
Aleksey.