Rule assignment of expense rule and configuration ID not work

Hello

I try to set up two expense rules for same employ No. The expense rule of “xx-rule” with configuration ID of “NORMAL”  is generic for all employees, and special rule of “CAR” with configuration ID of “CAR-PRI” for 090006 if there is other purpose. 

When 090006 create a travel request, and choose expense rule of “xx-rule”, the configuration ID can not be chosen to “NORMAL” but only “CAR-PRI”, why it can not match as rule assignment? how to make it happen? please advise. 

Thanks

Susan