This setting only pertains to the use of the Document | OnDocChanged inbound operation to send an XML rendition of a document from OnBase to a line-of-business application.
When set to true(default), the XML rendition is validated against the message schema.
When set to false, the XML rendition is not validated against the message schema. The XML rendition is always sent to the line-of-business application, even if the XML rendition is invalid.
Tip:
Setting ValidateMessageSchema to false decreases the time it takes to process each message.