erp5_simulation: fix the case when it's a list

bt5/erp5_simulation/ToolComponentTemplateItem/portal_components/tool.erp5.SolverProcessTool.py

@@ -98,10 +98,15 @@ class SolverProcessTool(BaseTool):
       # XXX using delivery's solver category is not so good idea,
       # because we might want to solve several deliveries with one
       # solver process, several users want to solve one document etc.
-      delivery = delivery_or_movement.getRootDeliveryValue()
-      solver_list = delivery.getSolverValueList()
-      solver_list.append(new_solver)
-      delivery.setSolverValueList(solver_list)
+      if not isinstance(delivery_or_movement, (tuple, list)):
+        delivery_or_movement = [delivery_or_movement]
+
+      for x in delivery_or_movement:
+        delivery = x.getRootDeliveryValue()
+        solver_list = delivery.getSolverValueList()
+        if new_solver not in solver_list:
+          solver_list.append(new_solver)
+          delivery.setSolverValueList(solver_list)
 
     return new_solver