Thanks Vlad!!!

The problem was there are several different handles. I modify my database to define that the remote views use the same handle (advanced options), and correct with this code:

handl = sqlgetprop ( "connecthandle", "vpredios" )
sqlsetprop ( handl, "transactions", 2 )
..

Also, i try the use of the TSQL instructions "BEGIN TRANSACTION", "COMMIT TRANSACTION" and "ROLLBACK TRANSACTION" but don't work!!!.