Coming in GP 2013: Saved Batch Approval .
Batch Approver and Approval Date will now be saved in the GL20000 and GL30000 tables.
Feature of the Day: Saved Batch Approval – Inside Microsoft Dynamics GP – Site Home – MSDN Blogs
Tips & Hidden FeaturesMicrosoft & the GP EcosystemGP 2013
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.