call solver_workflow's transition when registering solving activity.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31409 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/SolverProcess.py

@@ -138,6 +138,7 @@ class SolverProcess(XMLObject, ActiveProcess):
       Start solving
     """
     for solver in self.contentValues(portal_type=self.getPortalObject().getPortalTargetSolverTypeList()):
+      solver.startSolving()
       solver.activate(active_process=self).solve()