It depends on how you want to handle them.
You can use the try/catch structure in the top level service to catch errors from child services.
You can use the try/catch structure in any level service to facilitate retry, error mapping, ignoring errors, etc.
If you’re not familiar with try/catch in FLOW services, you can search the forums for examples and information. The GEAR documentation and the IS Developer User’s Guide also describe how to create try/catch structures.
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