The "Add For-Each" node function is specifically designed for iterative mapping scenarios. It allows a user to loop over a repeating source element (a node set), such as multiple line items in a purchase order or invoice. For each instance of the source element found, it creates a corresponding instance of the target node. This is the fundamental mechanism for handling one-to-many or many-to-many mappings of repeating structures within the Ariba Cloud Integration Gateway (CIG) custom mapping tool.

B. Add Target Condition: This function creates a target node only if a specified condition evaluates to true; it does not perform a loop.

C. Add Target Value Variable: This function is used to store a value in a variable for later use within the mapping, not for creating node sets.

D. Add Constant Value: This function assigns a fixed, static value to a target field and is not used for looping or structural mapping.

1. SAP Help Portal - Ariba Cloud Integration Gateway: Custom mapping in the mapping tool. This official guide details the functions available. The section "Node functions" explicitly describes "Add For-Each" as the function to "create a target node set by looping over a source element." It also defines the other functions listed, confirming their different purposes. (Accessed under SAP Ariba Cloud Integration Gateway > Configuring the SAP Ariba Cloud Integration Gateway > Custom mapping in the mapping tool).