Issue in Solution Import

Hi,

I am trying to import manage solution from DEV to Production environment. I am getting "The Import of solution failed. The following component is missing from the solution". Due to "Entity Relationship" it says that "tad_incident_sharepointdocument" is missing from solution and is required on production. A i checked this relationship is already  there on "Production or Dev solution". 

I am posting XML from dev enviroment for relationship.

 <EntityRelationship Name="tad_incident_sharepointdocument">
      <EntityRelationshipType>OneToMany</EntityRelationshipType>
      <IsCustomizable>1</IsCustomizable>
      <IntroducedVersion>1.0</IntroducedVersion>
      <IsHierarchical>0</IsHierarchical>
      <ReferencingEntityName>SharePointDocument</ReferencingEntityName>
      <ReferencedEntityName>Incident</ReferencedEntityName>
      <CascadeAssign>NoCascade</CascadeAssign>
      <CascadeDelete>RemoveLink</CascadeDelete>
      <CascadeReparent>NoCascade</CascadeReparent>
      <CascadeShare>NoCascade</CascadeShare>
      <CascadeUnshare>NoCascade</CascadeUnshare>
      <IsValidForAdvancedFind>1</IsValidForAdvancedFind>
      <ReferencingAttributeName>tad_regardingid</ReferencingAttributeName>
      <RelationshipDescription>
        <Descriptions>
          <Description description="Unique identifier for Case associated with Sharepoint Document." languagecode="1033" />
        </Descriptions>
      </RelationshipDescription>
      <field name="tad_regardingid" requiredlevel="none" lookupstyle="single" lookupbrowse="0" format="">
        <IsCustomizable>1</IsCustomizable>
        <IsRenameable>1</IsRenameable>
        <CanModifySearchSettings>1</CanModifySearchSettings>
        <CanModifyRequirementLevelSettings>1</CanModifyRequirementLevelSettings>
        <IsSecured>0</IsSecured>
        <DisplayMask>ValidForAdvancedFind|ValidForForm|ValidForGrid</DisplayMask>
        <IsAuditEnabled>0</IsAuditEnabled>
        <displaynames>
          <displayname description="Regarding" languagecode="1033" />
        </displaynames>
      </field>
      <EntityRelationshipRoles>
        <EntityRelationshipRole>
          <NavPaneDisplayOption>UseCollectionName</NavPaneDisplayOption>
          <NavPaneArea>Details</NavPaneArea>
          <NavPaneOrder>10000</NavPaneOrder>
          <CustomLabels>
            <CustomLabel description="" languagecode="1033" />
          </CustomLabels>
        </EntityRelationshipRole>
      </EntityRelationshipRoles>
    </EntityRelationship>

Any Suggestions.

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Amit