Symptoms

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You've enabled credentialless discovery but you are getting an error on the pattern: 

In payload invalid data source [CredentiallessDiscovery] exist. You need to provide a valid choice value from field [discovery_source] in table [cmdb_ci] 

Cause

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You are missing the CredentiallessDiscovery choice from the Discovery Source column on cmdb_ci

Resolution

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Manually create or use the attached record.