OTM provides the flexibility to associate custom attributes — also called refnums — to every transaction object such as Order Base, Order Release, and Shipment. Developers can use these refnums to store client-specific values like source system information, custom dates, and other custom fields. Note that newer versions of OTM also have attribute (flex field) columns for the same purpose, which are covered in a separate post.

To create a refnum, navigate to the specific business object menu. For a Shipment refnum: