POU_DELETED

Severity: error (with surviving callers) / warn (no callers)

A POU was deleted; the engine cross-checks the new revision for surviving call sites.

Why it matters. The compiler tells you about callers; the engine beats it to the answer at PR-review time. Severity downgrades when there are no callers, that's a clean retirement.

Settings. No check-specific config.

Trigger.

(* FB_Pump deleted from the codebase but MAIN.st still calls it: *)
fbPump(xEnable := TRUE);

The bot posts.

🟥 error  POU_DELETED
Call to deleted function_block FB_Pump
FB_Pump no longer exists in the new revision.

Fix. Restore the POU or update / delete the surviving call sites.