Fix accounting tests in Python 2.

See merge request !1914
3 jobs for zope4py3 in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-Zope4Py3

02:42:31

failed ERP5.CodingStyleTest-Zope4Py3-py2

02:29:52

failed ERP5.UnitTest-Zope4Py3

03:22:42