Multi-instance data mapping is available when the target of a data-element-to-data-element mapping is a multi-instance structure. The key uniquely identifies a specific instance of the structure. Key values must be unique in an order item.
To configure the key for a multi-instance structure:
Open a mapping rule and click the Mapping tab.
In the Entries table, select the mapping you would like to configure.
In the Mapping subtab, select a mapping target that is part of a multi-instance structure.
The Multi-Instance and Multi-Instance Expression subtabs are displayed in the Mapping Rule Item area.
Do one of the following:
To use an order item property as the key, in the Multi-Instance subtab, in the Source Property Key field, select an order item property to use as the key element.
To use the element defined as the structure key in the data schema, in the Multi-Instance subtab, select the Use Default Key option.
Do select the key using an XQuery expression, in the Multi-Instance Expression subtab, provide XQuery information to determine the key. See "About Creating XQuery Expressions with Design Studio" for more information about entering information into XQuery controls. See "About Multi-Instance XQuery Expressions" for more information about this XQuery field.