variable with two different type error

זה הסקריפט שיש מתחת ל POST-FIELD
[

GOTO 1 WHERE :$.PRICE_DEST <> 0 ;
:A_PRICE_DEST = 0;
SELECT PRICE_DEST INTO :A_PRICE_DEST
FROM AMIT_CUSTOMERS
WHERE CUST = :$.CUST;
:$.PRICE_DEST = :A_PRICE_DEST;
LABEL 1;