Try

lcList = "16, 10, 12, 15, 8, 1"
CREATE CURSOR crsList (customer_id int, sortord int)

FOR i=1 TO ALINES(laList, lcList, ",")
	INSERT INTO crsList VALUES(VAL(laList[i]), i)
ENDFOR

select cs.customer_id   ;
	from Customer cs ;
		JOIN crsList ls ON ls.customer_id = cs.customer_id ;
	ORDER BY ls.sortord ;	
	into cursor curCustormer

>

>select customer_id  ;
>  from Customer ;
> where customer_id in (16, 10, 12, 15, 8, 1) ;
>  into cursor curCustormer
>

>
>How can I order the result cursor according to data in the set of inlist expressions
>
>