DMLOptions 'useDefaultRule' for an account's update - not working

Question

I'm trying to assign DML options to an account's update. It's working with the insert, but not wit an update.

Here is the code I'm using:

Database.DMLOptions dmlOpts = new Database.DMLOptions();
dmlOpts.assignmentRuleHeader.useDefaultRule = true;
List<Account> accs = [SELECT Id FROM Account LIMIT 10];
Database.update(accs,dmlOpts);

After running that, no territory rules are running. I know how to do it with Visualforce, but no idea using just APEX (as I really need).

Thanks!

Answer 1

From the docs at http://www.salesforce.com/us/developer/docs/apexcode/Content/langCon_apex_dml_database_dmloptions.htm

The Database.DMLOptions object supports assignment rules for cases and leads, but not for accounts or territory management.

The correct assignment on insert must be based on some default value being set?