Use a one-sided looped assignment mapping to specify a value
to be mapped to an [All] node on the target side. The following steps show
you how to create a one-sided looped assignment mapping.
Right-click the [All] node on the target side and click Create
One-sided Mapping.
Specify the number of instances to which you want to map. The maximum number of instances to which you can map is the cardinality
of the selected field.
In the Message Flow Mapping editor Overview, the word undefined appears
in the Target Value column. Click this Target Value then click the box that
appears next to this value.
The Compose Mapping Expression editor opens and you can assign
the value that you want to use for the target. Using this loop,
the same target value is set for all specified instances.
Click OK to close the editor. The value that you have set for the target now appears in the
Target Value column.