tested property can be multiple.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33753 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/SolverType.py

@@ -32,7 +32,8 @@ class SolverType:
 
     _properties = (
         { 'id':         'tested_property',
-          'type':       'string',
+          'type':       'lines',
+          'default'     : (),
           'mode':       'w',
           'label':      'Property to be solved'
          },