[ZDP] BackTalk to Document The Zope Book (2.6 Edition)/Using Basic Zope Objects

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A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/BasicObject.stx#3-59

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      Before you can use an External Method from within Zope, you need
      to create an External Method object in your Zope Management
      Interface that "refers to" the function in the file that you
      just created.  Reopen your browser window and visit the Zope
      Management Interface.  Navigate to the Sales folder and select
      *External Method* from the Add list.  The Add Form for an
      Exernal Method will appear.  Provide an 'Id' of "SalesEM", a
      'Title' of "Sales External Method", a 'Module Name' of "SalesEM"
      and a 'Function Name' of "SalesEM".

        % pratyush - June 4, 2004 5:42 am:
         I tried to "add" SalesEM, but got the following error:
          The specified module, SalesEM, couldn't be found. (Also, an error occurred while attempting to render the
          standard error message.)
         and this is bit a bit difficult so plz do give some examples