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NetSuite Professionals

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This is a native feature
<https://docs.oracle.com/en/cloud/saas/netsuite/ns-online-help/section_N2409296.html|https://docs.oracle.com/en/cloud/saas/netsuite/ns-online-help/section_N2409296.html>

The field is called Transaction on a WO....it is not available to the form customization so it must show up automatically.  Are you using non-inventory items on the WO?