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A background task called something like 'Scheduling System Data USERS' generates a recurring Application Message error every 10 minutes, referencing a URL that doesn't exist — is this task actually required, and what should the URL be set to?

Answer

This is the PSO (Planning and Scheduling Optimization) integration's user-sync task — if you're not actually using PSO integration, the fix is simply to disable the corresponding Scheduled System Task (something like 'PSO Integration [USERS]') rather than trying to configure a working URL for it. Once that scheduled task is disabled and no longer running, the routing rules and other PSO-related configuration it would otherwise depend on don't matter at all.

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