>If the table is used under particular alias, you can not use it under the same alias, you need to use different alias, e.g.

> use myTable again alias newAlias in 0 shared

That is true if you are gonna run that code only once

Close database All
use (_samples+'data\customer') again alias newAlias in 0 shared && First Run Works 
use (_samples+'data\customer') again alias newAlias in 0 shared && Second run don't work

That is what hapenening with the Post owner code

If you want to use the same code over and over again, you should do something like

Close Database All
use (_samples+'data\customer') again alias newAlias in Select("newalias") shared && Works
use (_samples+'data\customer') again alias newAlias in Select("newalias") shared && Works