Create/Amend multiple Item User Defined Costs

<?xml version="1.0" encoding="UTF-8"?>
<SSC>
   <User>
      <Name>PKP</Name>
   </User>
   <SunSystemsContext>
      <BusinessUnit>PKP</BusinessUnit>
   </SunSystemsContext>
   <Payload>
      <Item>
         <ItemCode>UDCZT01000</ItemCode>
         <Costs>
            <CostAnalysisId>2</CostAnalysisId>
            <CostTypeCode>UNIT</CostTypeCode>
            <CurrencyCode>GBP</CurrencyCode>
            <ItemUserDefinedCost>
               <ItemUserDefinedValue>999.111</ItemUserDefinedValue>
               <Period>0052003</Period>
               <UserDefinedCostDefinitionCode>UDC01</UserDefinedCostDefinitionCode>
            </ItemUserDefinedCost>
         </Costs>
      </Item>
      <Item>
         <ItemCode>UDCZT01001</ItemCode>
         <Costs>
            <CostAnalysisId>2</CostAnalysisId>
            <CostTypeCode>UNIT</CostTypeCode>
            <CurrencyCode>GBP</CurrencyCode>
            <ItemUserDefinedCost>
               <ItemUserDefinedValue>999.111</ItemUserDefinedValue>
               <Period>0052003</Period>
               <UserDefinedCostDefinitionCode>UDC01</UserDefinedCostDefinitionCode>
            </ItemUserDefinedCost>
         </Costs>
      </Item>
   </Payload>
</SSC>