Webservice no User is posted

Hi Guys,

I have a short question regarding Webservices:

I added a new Good Movement via Webservice. Works perfect BUT the Problem is the Service is not able to add the User in the Table.

Does anyone has an Idea: Is it possible to add the User via webservice (CREATED BY)?

I added in the Webservice an external ID but this doesn´t work:

i.e here is my Request:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:glob="http://sap.com/xi/SAPGlobal20/Global">

   <soapenv:Header/>

   <soapenv:Body>

      <glob:GoodsAndActivityConfirmationGoodsMovement>

         <!--1 or more repetitions:-->

         <GoodsAndActivityConfirmation>

            <ExternalID>EXT26</ExternalID>

            <SiteID>P1100</SiteID>

            <!--1 or more repetitions:-->

            <InventoryChangeItemGoodsMovement>

               <ExternalItemID>EXT26</ExternalItemID>

               <MaterialInternalID>P100101</MaterialInternalID>

               <OwnerPartyInternalID>1000000</OwnerPartyInternalID>

               <InventoryRestrictedUseIndicator>false</InventoryRestrictedUseIndicator>

               <InventoryStockStatusCode></InventoryStockStatusCode>

               <!--Optional:-->

               <SourceLogisticsAreaID>P1100-20</SourceLogisticsAreaID>

               <TargetLogisticsAreaID>P1100-10</TargetLogisticsAreaID>

               <!--Optional:-->

               <InventoryItemChangeQuantity>

                  <!--Optional:-->

                  <Quantity unitCode="EA">2</Quantity>

                  <!--Optional:-->

                  <QuantityTypeCode>EA</QuantityTypeCode>

               </InventoryItemChangeQuantity>

               <!--Optional:-->

            </InventoryChangeItemGoodsMovement>

         </GoodsAndActivityConfirmation>

      </glob:GoodsAndActivityConfirmationGoodsMovement>

   </soapenv:Body>

</soapenv:Envelope>

An other Question: Is it possible to build an external Login Application? I have one technical User which uses the Webservice.

An want to add with the normal business user via webervice..

Is this possible and if YES. Any hints please.

Regards Manfred