Using Application Properties in the Mapper
You can use application properties when mapping an input field. The application properties available for mapping are grouped under the $property domain-specific scope in the mapper. All mapper rules and conditions apply to the use of application properties as well. For example, the data type of the application property value must match with the input field data type when mapping. Connection-related application properties that are used by any connection field in an activity do not appear under $property since they cannot be accessed. Connection-related application properties cannot be used for configuration anywhere within an app. Their only purpose is to allow you to change a connection value if need be during runtime. Hence, they cannot be used to map input fields.
Refer to the section on Mapper for details on how to use the mapper.