Dependent CASE function of another CASE function in a SELECT statement

[EORTIZ]

I would like to know the way that I can write a CASE function in a select statement that uses another variable that is created in the same SELECT statement using another CASE function. This is exacly what I am trying to do but obviusly gives me an error because is incorrect:

SELECT
CSV_SRV_QTY,
NET_PAID,
case when NET_PAID=0 THEN 0 ELSE CSV_SRV_QTY END AS ADJUNITS1,
CASE WHEN NET_PAID<0 AND ADJUNITS1>0 THEN -(ADJUNITS1) ELSE ADJUNITS1 END AS ADJUNITS2
FROM
CSV_MSTR
;

ADJUNITS1 runs fine but when add the second variable (ADJUNITS2) it produces an error.

[EORTIZ]

NEVER MIND, HERE IS THE ANSWER. MAYBE SOMEONE IS INTERESTED

select units, total_paid, adjunits1,
CASE WHEN total_paid<0 AND ADJUNITS1>0 THEN -(ADJUNITS1) ELSE ADJUNITS1 END AS ADJUNITS2 from
(SELECT 
    CSV_MSTR.CSV_SRV_QTY as units, 
    CSV_MSTR.NET_PAID as total_paid,
    case when NET_PAID=0 THEN 0 ELSE CSV_SRV_QTY END AS ADJUNITS1
 
FROM 
    CSV_MSTR )