My integration was not working with only this error in the eventlog:

Microsoft.ServiceModel.Channels.Common.XmlReaderGenerationException: An error occurred when trying to convert the byte array [30-00-30-00-30-00-30-00-30-00-30-00-30-00-30-00] of RFCTYPE RFCTYPE_DATE with length 8 and decimals 0 to XML format. Parameter/field name: REF_DATE   Error message: Year, Month, and Day parameters describe an un-representable DateTime. —> System.ArgumentOutOfRangeException: Year, Month, and Day parameters describe an un-representable DateTime. 

Generating new xsd schemas from the adapter with the option enable safetyping was not helping. Then I changed the document type to rfc:

This worked, the message was received by BIzTalk, but a complete other schema! The setting was set in SAP to put out a Typed document.

You do not see anything happening in BizTalk when this happens only in the evenlog. I was changing the settings of the SAP adapter and every time the SAP guy needed to send the document again. Hope this saves some time for you.

Cheers.