Beadle,
By default TNWeb will display the System attributes, but if you want the Partner to be able to see a custom document attribute, you will have to extract that attribute in your TN Document type. To do so, open the document in TNConsole, then under the Extract tab add the attribute to the extracted attributes list by specifying the query. Once you have defined how to extract the required attribute, the query in TNWeb will display that attribute when document details are viewed.
In short if an attribute is extracted in the TN Doc Type definition, the attribute will be displayed to all the Trading Partners who access that document type. If you want to display this attribute only to select Trading Partners, you might have to look into Transformation of this attribute using a custom service.
HTH, Rohit
#Integration-Server-and-ESB#B2B-Integration#webMethods