Add input fields to an Input transformation to define the fields that you want to pass into the mapplet. You must add at least one input field to each Input transformation.
Add input fields on the Input Fields tab. To add a field, click Add Fields, and then enter the field name, data type, precision, scale, and optional description. The description can contain up to 4000 characters.
When you use the mapplet in a Mapplet transformation, map at least one input field to the upstream transformation.