code: def get_relations(self, service_title, default_obj, obj_type, catalog_name, sheet_name, column):
          
          out_objects = [default_obj] if default_obj else []
          cat = getToolByName(self.context, catalog_name)
          worksheet = self.workbook.get_sheet_by_name(sheet_name)
          if not worksheet:
              return out_objects
          for row in self.get_rows(3, worksheet=worksheet):
              row_as_title = row.get('Service_title')
              if not row_as_title:
                  return out_objects
              elif row_as_title != service_title:
                  continue
              obj = self.get_object(cat, obj_type, row.get(column))
              if obj:
                  if default_obj and default_obj.UID() == obj.UID():
                      continue
                  out_objects.append(obj)
          return out_objects
docs: Return an array of objects of the specified type in accordance to
              the object titles defined in the sheet specified in 'sheet_name' and
              service set in the paramenter 'service_title'.
              If a default_obj is set, it will be included in the returned array.