In Review Stages, the batch is Checked-out (materialized) based on the group ranking and the sort order defined for that batch. So when using the Next Available option, documents will be pulled from the next highest ranking group with un-reviewed documents, in the defined sort order.
Furthermore, within a given group, we give precedence in the following order:
- Any checked in batches that have zero docs reviewed
- New Batch
- Any checked in batches that have been partially reviewed