Direct-Bound Send Shape blows-up with Inner exception: Input string was not in a correct format. (FormatException)

Hi,

   I’m sending a message to a direct bound request/response port to call our own internal ExceptionHandler.  I’ve built my message, written to a trace file and it looks fine and validates.  However, the SEND shape is blowing-up with this message.

 Description:
Uncaught exception (see the ‘inner exception’ below) has suspended an instance of service ‘TMAC.LaSalle.BizTalk.Orchestrations.orchRcvDocsFromLaSalle(37b4c739-2b9e-ccf7-45aa-a6bf4a1bb7b7)’.
The service instance will remain suspended until administratively resumed or terminated.
If resumed the instance will continue from its last persisted state and may re-throw the same unexpected exception.
InstanceId: 504b63de-8e2c-475f-a474-a840703d7de9
Shape name: Send_1
ShapeId: 7ccdc612-8dbc-4a18-b28c-a2b84676ae8f
Exception thrown from: segment 5, progress 18
Inner exception: Input string was not in a correct format.
       
Exception type: FormatException
Source: mscorlib
Target Site: Void StringToNumber(System.String, System.Globalization.NumberStyles, NumberBuffer ByRef,
System.Globalization.NumberFormatInfo, Boolean)
The following is a stack trace that identifies the location where the exception occured

   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at System.Xml.XmlConvert.ToInt32(String s)
   at Microsoft.XLANGs.RuntimeTypes.XmlHelpers.ParseString(String s, Type targetType, Boolean throwIfNotParsed)
   at Microsoft.XLANGs.RuntimeTypes.XmlHelpers.ChangeType(Object val, Type targetType)
   at Microsoft.XLANGs.Core.XMessage.GetContentProperties()
   at Microsoft.BizTalk.XLANGs.BTXEngine.BTXXlangStore.PrepareMessage(XLANGMessage msg, IList promoteProps, IList toPromote)
   at Microsoft.BizTalk.XLANGs.BTXEngine.BTXXlangStore.PersistMessageState(XLANGMessage msg)
   at Microsoft.XLANGs.Core.XMessage.PrePersist(Boolean dehydrate, IStateManager state)
   at Microsoft.XLANGs.Core.ReferencedMessages.PrePersist(Boolean dehydrate, Context state)
   at Microsoft.XLANGs.Core.Context.PrePersist(Boolean dehydrate, Context state)
   at Microsoft.XLANGs.Core.Context.PrePersist(Boolean dehydrate, XlangStore store)
   at Microsoft.XLANGs.Core.ExecutingSubStates.PrePersist(Boolean dehydrate, Context ctx)
   at Microsoft.XLANGs.Core.Context.PrePersist(Boolean dehydrate, Context state)
   at Microsoft.XLANGs.Core.Context.PrePersist(Boolean dehydrate, XlangStore store)
   at Microsoft.XLANGs.Core.ExecutingSubStates.PrePersist(Boolean dehydrate, Context ctx)
   at Microsoft.XLANGs.Core.Context.PrePersist(Boolean dehydrate, Context state)
   at Microsoft.XLANGs.Core.ServiceContext.PrePersist(Boolean dehydrate, Context state)
   at Microsoft.XLANGs.Core.Service.PrePersist(Boolean dehydrate, Context ctx)
   at Microsoft.XLANGs.Core.Service.Persist(Boolean dehydrate, Context ctx, Boolean idleRequired, Boolean finalPersist, Boolean bypassCommit, Boolean terminate)
   at Microsoft.XLANGs.Core.LongRunningTransaction.PendingCommit(Boolean ignore, XMessage msg)
   at Microsoft.BizTalk.XLANGs.BTXEngine.BTXPortBase.SendMessage(Int32 iOperation, XLANGMessage msg, Correlation[] initCorrelations, Correlation[] followCorrelations, SubscriptionWrapper& subscriptionWrapper, Context cxt, Segment seg, ActivityFlags flags)
   at Microsoft.XLANGs.Core.PortBase.SendMessage(Int32 iOperation, XLANGMessage msg, Correlation[] initCorrelations, Correlation[] followCorrelations, SubscriptionWrapper& subscriptionWrapper, Context cxt, Segment seg)
   at TMAC.LaSalle.BizTalk.Orchestrations.orchRcvDocsFromLaSalle.segment5(StopConditions stopOn)
   at Microsoft.XLANGs.Core.SegmentScheduler.RunASegment(Segment s, StopConditions stopCond, Exception& exp)

I’ve checked all my promoted fields, and the values all seem to match the proper type.

Any ideas?
Thanks,

Neal Walters