SCD issue when multiple records in the source dataset have same natural key

When I load a dataset into a slowly changing dimension, sometimes the dataset contains multiple records for the same natural key. The rows are different by the column last_update_date (among other possible differences).
The behavior I want is this: if during an ODI job run, the source dataset contains multiple records for one natural key, all records will load into the dimension, but only the record with the greatest last_update_date gets marked as the current record in the dimension. Right now, ODI is marking all of the incoming rows for the natural key as current. Any ideas? Thanks!

Last_update_date is on the source but is not being sent to the target. Thus, it doesn't have an SCD behavior. I think my solution will be to pre-process the incoming records so I don't attempt to load multiple rows per natural key. I was just hoping someone here knew of an easier solution.
If it helps, except for the SK, NK, Current Flag, and Effective Date fields, all SCD behaviors are "add row on change".

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