Based on FME Documentation , you should avoid manually defining attributes and instead follow these standard methods:
To "write a feature" for the project (or a similar FME-based workflow), you generally need to define a Feature Type within a Writer or use a FeatureWriter transformer to handle data mid-workflow. Key Steps to Write a Feature SFRAFmp4
When configuring your feature writer, you can specify how it interacts with the destination: : Adds new records (default behavior). Based on FME Documentation , you should avoid
: Requires a specific Row Selection condition (usually an ID field) to identify which records to modify. Adding Writer Feature Types - FME Documentation Based on FME Documentation