When is this a problem?
Data sources without an associated action are unnecessary.
Why is this a problem?
It can be confusing to have data sources without actions. It is best to keep things tidy.
How to correct:
Delete data sources that do not have actions associated with them.
Anapedia: Naming Conventions
Questions on this topic? See Check the data sources. Does each data source have an action associated with it? in our Model Optimization Checklist forum.