Tut,

> REPORT FORM RCUSTOMER FOR CUSTOMER.NAME='A' PREVIEW
>
> IT SUCCES LIKE WHAT I WANTED. BUT WHEN I PRINT IN THE PREVIEW FORM
> (THERE IS BUTTON PRINT THERE)

You will have better results with the preview if you select the records you want into a cursor, then run the report. Be sure the report fields are just the field name and not "table.field". Then you can:

SELECT * FROM customer
  INTO CURSOR temp ;
 WHERE name = 'A'
REPORT FORM rcustomer PREVIEW