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TIBCO BusinessEvents® Enterprise Edition 6.3.1

# ApplyDebit BadApplyDebit and CheckNegativeBalance Rules

It’s important to understand how conflict resolution and run to completion (RTC) cycles work.

When a `Debit` event is asserted into the Rete network, TIBCO BusinessEvents checks rules with the Debit event in their scope.

- The `ApplyDebit` rule has the Debit event in its scope, and also an account ID. It’s priority 1 so it will execute before any other lower priority rule. The engine checks the rule conditions.
  - If the Rete network also contains an Account instance whose ID matches the ID in the debit event, the rule executes. If the account is suspended, a message to that effect displays in the console. Otherwise, the account is debited. A message displays in the console to this effect.
  - If the Rete network does not contain a matching Account instance, then other rules in the agenda — those that have debit events in their scope — are eligible to execute. `BadApplyDebit` is the only rule with the Debit event in its scope, so it is eligible and it executes. It sends a message to the console that no matching account is found.
- The `CheckNegativeBalance` rule has an `Account` concept in its scope. When an account is debited the Account concept is changed, and so the `CheckNegativeBalance` rule becomes "newly true." The effect is similar to assertion of a new entity into the Rete Network. If the debit has made the account balance negative, this rule sets the status to Suspended.

## Learning Points

If you understand what triggers rules to execute, and why a rule may not execute, you can design rules more effectively.

For a reminder, carefully reread Understanding Conflict Resolution and Run to Completion Cycles in TIBCO BusinessEvents Architect Guide.

## More Information

- See all references provided for Adding the InitializeScorecard Rule Function.
- See Runtime Inferencing Behavior in TIBCO BusinessEvents Architect Guide.

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TIBCO BusinessEvents® Enterprise Edition

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