On the Ports tab, you can configure the following properties:
Columns defined by
Select one of the following options to define Write transformation columns:
Associated data object. Use column names, metadata, and other properties from the data object in the Data Object tab.
Mapping flow. The mapping fetches column names, metadata, and other properties from the upstream objects in the mapping.
Default is the Associated data object option.
Column resource properties
Available for flat file and customized targets. The resource for each column is the data object from which the column fetches its name, metadata, and other properties. Select the resource name to change resource properties.