Is this type assignment error an error in WCF or Windows Workflow Foundation 4.5?

I have a Workflow Foundation 4.5 WCF Workflow application. I am trying to return Dictionary<IEdmEntityType, DataTable>from mine CodeActivity<Dictionary<IEdmEntityType, DataTable>>. The code does not encounter a compile-time error, but XAML cannot compile.

The relevant parts of my XAML look like this:

We have variable declarations for the sequence where I am trying to reset my return value. The variable we are trying to assign is called EntityTableRelationships.

<p1:Sequence.Variables>
  <p1:Variable x:TypeArguments="x:String" Name="MetadataContent" />
  <p1:Variable x:TypeArguments="scg:Dictionary(mde:IEdmEntityType, sd:DataTable)" Name="EntityTableRelationships" />
</p1:Sequence.Variables>

There is also a OutArgumentreturn value from Execute, from our CodeActivity<..>assigned EntityTableRelationships.

<o:TransformMetadataToTables.Result>
  <p1:OutArgument x:TypeArguments="scg:Dictionary(mde:IEdmEntityType, sd:DataTable)">
    <mca:CSharpReference x:TypeArguments="scg:Dictionary(mde:IEdmEntityType, sd:DataTable)">EntityTableRelationships</mca:CSharpReference>
  </p1:OutArgument>
</o:TransformMetadataToTables.Result>

XAML validation bug fixed:

Type 'http://schemas.microsoft.com/netfx/2009/xaml/activities:OutArgument(Dictionary)' is not assignable to type 'http://schemas.microsoft.com/netfx/2009/xaml/activities:OutArgument(Dictionary)' of member 'EntityTableRelationships'.

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№ 1

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№ 2

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№ 3

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