This feature enables you to maintain the history of changes that have taken place on an order
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Versioning
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Mass update
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Document Sequence
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Audit Trail
Audit Trail is the feature that maintains history of changes made to a purchase order. It tracks who changed what and when, providing a complete change history. Versioning manages different versions, Document Sequence controls numbering, and Mass Update is for bulk changes.
Audit Trail is the feature that tracks and preserves the history of changes made to a record such as a sales/purchase order — who changed what field, when, and to what value — enabling traceability over time. Versioning tracks distinct saved revisions rather than a running change log, Mass Update applies bulk changes across many records (not a history feature), and Document Sequence merely governs numbering of documents. Since the question specifically asks about maintaining a history of changes, Audit Trail is the correct match.