Sorry, i spent those "dark days" with Clipper 5.01. Here is a native Clipper code :

use org
select org
index on schet to orgi
set index to orgi
seek "2"
? found() && .F.
inkey(0)
quit

P.S. ORG.DBF has a numeric field SCHET. No error messages, but FOUND() returns .F.