NCo throws an Exception calling BAPI_MATERIAL_SAVEDATA?

Question

I've been successful in calling BAPIs from NCo (BAPI_CHARACT_CREATE, BAPI_CLASS_CREATE, BAPI_VENDOR_FIND, BAPI_VENDOR_GETDETAIL)....
However when calling BAPI_MATERIAL_SAVEDATA, I always get the following Exception being thrown:
Index was outside the bounds of the array.
   at SAP.Connector.Rfc.RfcStructureUtil.ToRfcStructure(Object obj, Byte[] dest, Type t, Encoding encoding, Boolean isUnicode, PropertyInfo[] propinfos, RfcStructInfo structInfo)
   at SAP.Connector.Rfc.RfcStructureUtil.GetITabFromList(SAPConnection conn, Object list, Type t, RfcStructInfo structInfo, Int32 itab)
   at SAP.Connector.Rfc.RfcClient.PrepareClientParameters(Type classType, MethodInfo m, Boolean isTQRfc, Object[] MethodParamsIn, RFC_PARAMETER[]& paramsIn, RFC_PARAMETER[]& paramsOut, RFC_TABLE[]& tables, ParameterMap[]& paramMaps)
   at SAP.Connector.Rfc.RfcClient.RfcInvoke(SAPClient proxy, String method, Object[] methodParamsIn)
   at SAP.Connector.SAPClient.SAPInvoke(String method, Object[] methodParamsIn)
   at SAP_MM_Test.SAPProxy1.Bapi_Material_Savedata(BAPI_MARA Clientdata, BAPI_MARAX Clientdatax, String Flag_Cad_Call, String Flag_Online, BAPI_MPOP Forecastparameters, BAPI_MPOPX Forecastparametersx, BAPIMATHEAD Headdata, String No_Dequeue, String No_Rollback_Work, BAPI_MPGD Planningdata, BAPI_MPGDX Planningdatax, BAPI_MARC Plantdata, BAPI_MARCX Plantdatax, BAPI_MVKE Salesdata, BAPI_MVKEX Salesdatax, BAPI_MARD Storagelocationdata, BAPI_MARDX Storagelocationdatax, BAPI_MLGT Storagetypedata, BAPI_MLGTX Storagetypedatax, BAPI_MBEW Valuationdata, BAPI_MBEWX Valuationdatax, BAPI_MLGN Warehousenumberdata, BAPI_MLGNX Warehousenumberdatax, BAPIRET2& Return0, BAPIPAREXTable& Extensionin, BAPIPAREXXTable& Extensioninx, BAPI_MEANTable& Internationalartnos, BAPI_MAKTTable& Materialdescription, BAPI_MLTXTable& Materiallongtext, BAPI_MFHMTable& Prtdata, BAPI_MFHMXTable& Prtdatax, BAPI_MATRETURN2Table& Returnmessages, BAPI_MLANTable& Taxclassifications, BAPI_MARMTable& Unitsofmeasure, BAPI_MARMXTable& Unitsofmeasurex) in C:\Dev\SAP_MM_Test\SAPProxy1.vb:line 220
   at SAP_MM_Test.Form1.Button1_Click(Object sender, EventArgs e) in C:\Dev\SAP_MM_Test\Form1.vb:line 114"     String
I even tried calling the Method with all parameters set to Nothing and also get the same error.  I tested some of the other BAPI I listed will all Nothing parameters and it does not throw any exceptions.  Almost seems as if the Proxy generated classes did not get created properly or something?
Has anyone else successfully called BAPI_MATERIAL_SAVEDATA from NCo 2.0?
PS...I was successful in calling the BAPI from SE37 with the exact same data, therefore I know I have all the mandatory parameters specified (HeadData, ClientData, ClientDatax...etc)
Anything obvious in the following code?:
=======================================
     ' Connection String
     Dim cs As String = "ASHOST=10.83.180.239 SYSNR=10 CLIENT=110 USER=CMCHUG2 PASSWD=********"
     ' construct the proxy with connection string
     Dim proxy As New SAPProxy1(cs)
     ' Header Data
     Dim HeadData As New BAPIMATHEAD
     HeadData.Material = "000000000000000754"            ' Material NUmber (PAD to 18)
     HeadData.Ind_Sector = "U"                           ' Industry Sector
     HeadData.Matl_Type = "ERSA"                         ' Material Type (ERSA=Space Parts / HERS=Manufacturer Part)
     HeadData.Basic_View = "X"                           ' Need at least 1 view
     ' Client Data
     Dim ClientData As New BAPI_MARA
     ClientData.Matl_Group = "01"                        ' Material Group
     ClientData.Base_Uom = "EA"                          ' Base Unit of Measure
     ' Set the ClientData Indicator Table
     Dim ClientDataX As New BAPI_MARAX
     ClientDataX.Matl_Group = "X"
     ClientDataX.Base_Uom = "X"
     ' Short Description (TABLE)
     Dim ShortDesc As New BAPI_MAKTTable
     Dim sDescr As New BAPI_MAKT
     sDescr.Langu = "E"                                  ' Language
     sDescr.Matl_Desc = "Short Desc Test"               ' Short Description (Max 40)
     ShortDesc.Add(sDescr)
     Dim tblRet As New BAPIRET2
     Dim tblRetMsg As New BAPI_MATRETURN2Table
     proxy.Bapi_Material_Savedata(ClientData, ClientDataX, Nothing, Nothing, Nothing, Nothing, HeadData, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, tblRet, Nothing, Nothing, Nothing, ShortDesc, Nothing, Nothing, Nothing, tblRetMsg, Nothing, Nothing, Nothing)
Exception Thrown Here!!!

Answer 1

Reiner,
Tried what you suggested, still get the same results.  This the 3rd development system I try this from. In all cases I generated proxies via drop and drop of the SaveData Method under StandardMaterial (BOR).  Since it was just generated the MetaData should be up to date?, good suggestion thought, I could see where that might be a problem going against different backends.
My lastest attempt (I am quickly running out of ideas), was to generate a Standalone Proxy containing the SaveData method.  Same Results :{ 
I was able to create Standalone Proxies for the other Business Objects I'm using (Characteristics, Class..etc) without a hitch. (Except for "Class", complaining about the Class name generated (Public Class Class...so I renamed to sapClass).  Using the Standalone Proxy Class I might try from Visual Studio 2005 to see if I get the same results.
Also encountered another problem when trying to Add the whole BOR object StandardMaterial to the Proxy (so I would have access to a few of the Methods....this failed with some Java out of memory error....I would have to attempt this again to capture the exact error....when I get time I'll put that in another post).