If you need to filter your data to only send valid data to your output flows, you can create validation rules that will check your data. These validation rules can be a basic check for correct values or referential integrity check. For more information on how to create those rules, see Centralizing a Validation Rule in Managing Metadata for data integration. As they are stored at the metadata level in the Repository, they can be easily reused and modified.
To see how to use a validation rule, see the below section.