Hi Henry,
The property is not changeable on an existing database. The flag is really indicating if the database was created prior to CR #480072 or not. For further details, see: http://search.sybase.com/kbx/changerequests?bug_id=480072
It is quite possible that the ordering has 'changed' but it may no longer be 'incorrect' due to the same above fix that introduced the property.
Which exact version of SQL Anywhere 10 are you migrating from - is it prior to CR #480072 (10.0.1.3564)? It sounds like you might be on a lower version than this if the property doesn't exist in your version 10 database. Also, which version was the the database created on? (SELECT * FROM SYS.SYSHISTORY)
Regards,
Jeff Albion
SAP Active Global Support