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Invalid name prefix error when importing customization containing system attributes from another form

Hello. I am using Microsoft Dynamics CRM 4.0. I am trying to copying system attributes from the Case entity to a Custom entity. I followed the tutorial "Copying Attributes from one Entity to Another" on https://blogs.msdn.microsoft.com/dynamicscrmonline/2009/06/05/copying-attributes-from-one-entity-to-another/.

I exported the Case entity and Custom entity customization.xml files and copied the following Title system attribute XML code (from the Case entity) to the Custom entity customization.xml file:

            <attribute PhysicalName="Title">
              <Type>nvarchar</Type>
              <Length>400</Length>
              <ValidForCreateApi>1</ValidForCreateApi>
              <ValidForUpdateApi>1</ValidForUpdateApi>
              <ValidForReadApi>1</ValidForReadApi>
			  <IsCustomField>1</IsCustomField>			  
              <AttributeTypeId>00000000-0000-0000-00aa-11000000001e</AttributeTypeId>
              <DisplayMask>ActivityRegardingName|QueueItemTitle|ActivityPointerRegardingName|PrimaryName|ValidForAdvancedFind|ValidForForm|ValidForGrid|RequiredForGrid</DisplayMask>
              <Descriptions>
                <Description description="Title of the case." languagecode="1033" />
              </Descriptions>
              <ImeMode>auto</ImeMode>
              <RequiredLevel>required</RequiredLevel>
              <Format>text</Format>
              <MaxLength>200</MaxLength>
              <displaynames>
                <displayname description="Title" languagecode="1033" />
              </displaynames>
            </attribute>

The only change I made in the XML code as per the above tutorial was to add <IsCustomField>1</IsCustomField> after the ValidForReadApi tags.

After importing the edited Case entity customization.xml file I get the following error:

""Failure: new_customcase: Invalid name prefix"

Copying custom entities to the Custom entity form works, but system attributes such as the above Title, throws the above error.

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