“Error serializing/deserializing XML document” error when using BizTalk Adapter for Host Applications to process a message that includes discriminated unions

If you are using the BizTalk Adapter for Host Applications (BAHA) included with BizTalk Adapters for Host Systems (BAHS), you might encounter an error similar to the following error if the BAHA (i.e. Transaction Integrator) application includes discriminated unions: Log Name:      Application Source:        BizTalk Server 2009 Date:          Date Time Event ID:      5743 Level:         Warning User:         …

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