XHTML: export of ReqIF.Prefix Property of VP Requirements

Hi,
I try to edit VP requirements with XHTML addon. Identifier, Name, Long Name, Chapter Name, Text and Type are successfully edited but the property “ReqIF.Prefix” is not edited. Nethertheless, it is a default property of Doors importation.
How could I export this property in a XHTML file?

thank you
dCapture

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