How about:
lcKey = Tag()
SET ORDER TO &lcKey

HTH

>Good thing is that it can not be PRIMARY KEY (there are dupes and its "normal" for this case). Since there are only one "INDEX ON po TAG po", how should I can open an INDEX (not PRIMARY)?
>
>--> lcKey=DBGETPROP(lcTableName, "TABLE", "PrimaryKey")
>--> SET ORDER TO &lcKey