do not try to solve if a solver is already solving or solved state.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33572 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/SolverProcess.py

@@ -32,6 +32,7 @@ from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions, PropertySheet, interfaces
 from Products.ERP5Type.XMLObject import XMLObject
 from Products.CMFActivity.ActiveProcess import ActiveProcess
+from Products.ERP5Type.Errors import UnsupportedWorkflowMethod
 
 class SolverProcess(XMLObject, ActiveProcess):
   """
@@ -150,9 +151,11 @@ class SolverProcess(XMLObject, ActiveProcess):
       Start solving
     """
     for solver in self.contentValues(portal_type=self.getPortalObject().getPortalTargetSolverTypeList()):
+      try:
         solver.startSolving()
         solver.activate(active_process=self).solve()
-
+      except UnsupportedWorkflowMethod:
+        pass
 
   # API
   def isSolverDecisionListConsistent(self):