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Enabling Custom Event actions and Projection Actions for Workflows (BPA) starts failing with an error after an upgrade, despite the same configuration working fine before the upgrade.

Answer

Check for custom events or actions still referencing a BPA workflow that the upgrade itself removed — an upgrade can remove standard/example workflows without automatically cleaning up custom events or actions that still point at them, leaving a dangling reference that blocks enabling new custom events/actions in the same area; re-importing the missing workflow (for example, from a pre-upgrade environment or another instance that still has it) to restore the reference has resolved this exact class of post-upgrade error.

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