A duplicate field name ‘X’ was found.

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When adding a custom Content Type that contains a metadata field to SPList/Library, you can get the error message: A duplicate field name ‘X’ was found. (X can be the Name or ID (GUID) of metadata field).

Our custom Content Type is provided via a feature.

The problem comes from the order of Metadata fields in Content Type, the Note field should be after the Metadata field.

  <FieldRef ID="{F88D530B-705F-488A-9069-FAF5C79B61F7}" Name="RegionalOffice"/>
  <FieldRef ID="{9EDAB26E-CC44-4027-AB05-CB44EA3A6F72}" Name="RegionalOfficeTaxHTField0"/>
If the .order of Note field is above the Metadata field like below, you can get the error.
<FieldRef ID="{9EDAB26E-CC44-4027-AB05-CB44EA3A6F72}" Name="RegionalOfficeTaxHTField0"/>
<FieldRef ID="{F88D530B-705F-488A-9069-FAF5C79B61F7}" Name="RegionalOffice"/>

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