Subject: Problem in getting field value using an embedded view action button
@Prompt in an embedded view document will not definitely work. The workaround on your proble is to use Lotus Script in your view action. Here is your reference script
Set NotesUIView = NotesUIWorkspace.CurrentView
Set NotesDocumentCollection = NotesUIView.Documents
Set NotesDocument = NotesDocumentCollection.GetFirstDocument
Messagebox NotesDocument.FieldName (0)