SELECT customid, vorname, nachname 
FROM zsch017customer
INTO @DATA(ls_customer_sub) 
UP TO 1 ROWS.
WRITE: / ls_customer_sub-vorname,
ls_customer_sub-nachname.
SELECT ort, strasse
FROM zsch017address
INTO @DATA(ls_address_sub)
UP TO 2 ROWS
WHERE customid = @ls_customer_sub-customid. 
WRITE: / ls_address_sub-ort.
WRITE: ls_address_sub-strasse.
ENDSELECT.
ENDSELECT.