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Is there a maximum number of fields that can be sent through an Outbound Message? I cannot find it documented anywhere.

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    Documentation rarely calls out non-limits. I would say that the fact that there is no documented limit probably means there is no limit. I just tested a message with over 140 fields, and no error was produced.
    – sfdcfox
    Sep 14, 2015 at 17:54

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I see you've tagged your question with workflowoutboundmessage, so assume you're talking about a message to a SOAP/xml endpoint. Workflow, requires a template of some kind, so one couldn't write the code for the message entirely in Apex to send the object record as a class.

That said, I'd expect the limit to be based solely on the limits for custom fields and workflow rules because you could presumably send a complete record update via outboundmessaging. The limit would seem to be based on the limit of max number of custom fields within the constraints on the size of a single message transaction & session.

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