You can add a many-to-one output mapping in the following way, having defined your source and target.
You now need to define how the multiple elements are dealt with when they are placed into the single target element. For example, the source elements might need to be concatenated or have a mathematical function carried out on them.
In the Compose Expression editor, you can add mapping expressions for sources and targets that have not yet been defined, but you cannot change mapping targets.
Related concepts
Mappings
Mapping types
Message mapping
Many-to-one mapping
Related tasks
Adding a one-to-one mapping
Adding a one-sided mapping
Adding a many-to-many mapping
Adding a case mapping
Adding a repeating mapping
Related reference
Mappings
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