Requirement:

Prevent users from reconfiguring a bundle after its initial configuration.

Solution:

Set Configuration Type to Allowed to permit configuration during initial setup.

Set Configuration Event to Add to allow configuration only when the product is added, blocking reconfiguration later.

Why Other Options Are Incorrect:

A: Disabled blocks all configuration, including initial setup.

B: Configuration Event = Always allows continuous reconfiguration.

D: Reconfigure Line Custom Action is unrelated to this requirement.

Salesforce CPQ Reference:

Configuration Type and Event settings are documented in Bundle Configuration ​.