Be aware that by default Rational Software Architect displays the order of attributes alphabetically. Attribute ordering is significant for Entity and Struct classes when they are used to define indexes as the DDL that's generated for index creation relies on this ordering. You can view the attribute ordering via the Attribute tab of the class. You can also change the default behavior of Rational Software Architect from its default ordering of 'Stereotyped Type then Alphabetically' to 'Storage Order' by selecting the Windows menu and Preferences submenu. From the resulting dialog navigate to Views, Modeling, and Project Explorer where you can use the Project Explorer settings, Sort By drop-down to change the ordering; click OK to save your changes.
If you need to change the order of the attributes the Attributes tab provides 'Move up' and 'Move down' buttons as appropriate.