Calling out from a ruleset to a Virtual Storage Access Method file to augment data
Occasionally, you are required to call out from a ruleset to augment the data that is required to make a decision. Only call out from a ruleset to augment data in the following circumstances:
The data is not easily accessible to the application program.
The decision cannot be made without the data.
The data is required only in exceptional circumstances by the decision. ...

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