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** Branch linked: lp:openobject-server/6.0

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https://bugs.launchpad.net/bugs/405962

Title:
  Complex workflow for procurement causes pydot error

Status in OpenERP Server:
  Fix Committed
Status in OpenERP Server 5.0 series:
  Invalid

Bug description:
  I'm running OpenERP version 5.0.1 on Ubuntu 8.10.

  I select a procurement order in the desktop client and from the
  Plugins menu, I choose Execute a plugin. I double click Print Workflow
  (Complex). I quickly get a blank page. When I check the server output,
  I see this:

  [2009-07-28 11:59:01,045] ERROR:workflow:[01]: Exception in call: Traceback (most recent call last):
  [2009-07-28 11:59:01,047] ERROR:workflow:[02]:   File "/home/don/workspace/openerp-server-5.0.1/addons/base/ir/workflow/print_instance.py", line 150, in __init__
  [2009-07-28 11:59:01,047] ERROR:workflow:[03]:     ps_string = graph.create(prog='dot', format='ps')
  [2009-07-28 11:59:01,047] ERROR:workflow:[04]:   File "/var/lib/python-support/python2.5/pydot.py", line 1796, in create
  [2009-07-28 11:59:01,048] ERROR:workflow:[05]:     status, stderr_output) )
  [2009-07-28 11:59:01,048] ERROR:workflow:[06]: InvocationException: Program terminated with status: -6. stderr follows: dot: mincross.c:835: install_in_rank: Assertion `(g)->u.rank[r].n <= (g)->u.rank[r].an' failed.

  I've tried several procurement orders in different states, and they
  all cause the same error. I've tried the basic Print Workflow, and it
  works. I've tried the complex workflow on a production order, and it
  works.