[Zope] cannot create an external method with zope-2.9.0

[Joachim Schmitz]

when I try to create an external method under 2.9.0 this fails with
This is an install method in the Extension directory of the product 
WAeUP. The product is not broken, and this works under Zope-2.8.2.

Traceback (innermost last):
   Module ZPublisher.Publish, line 113, in publish
   Module ZPublisher.mapply, line 88, in mapply
   Module ZPublisher.Publish, line 40, in call_object
   Module Products.ExternalMethod.ExternalMethod, line 59, in 
manage_addExternalMethod
   Module Products.ExternalMethod.ExternalMethod, line 111, in __init__
   Module Products.ExternalMethod.ExternalMethod, line 134, in manage_edit
   Module Products.ExternalMethod.ExternalMethod, line 141, in getFunction
   Module App.Extensions, line 120, in getObject
NotFound: The specified module, <em>WAeUP.install</em>, couldn't be found.

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