po document type in event bus2012

[priyank dev]

hi ppl,
         I want to put the condition as docu type = 'NB' to trigger my
workflow.So i have inherited bus2012 to my z object and added a new event in
event section with parameters as po_docutype.But when i click the condition
tab in WF builder,its not displaying the event which created for
po_docutype.
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