Trying to limit the results of a group by query to a range of dates - oracle

Question

I'm trying to limit a query's results to the latest 14 distinct PROCESS_DATE dates. To do this, I have used a CTE expression to retrieve the latest and earliest dates for the date range
With these 2 values, I would like to plug them into a group by statement so that I will get results between the two dates
But I am getting this error when I run the query in Oracle
ORA-00904: "MAX_PROCESS_DATE": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
Error at Line: 24 Column: 60
Line: 24 Column: 60 is the WHERE PROCESS_DATE >= MIN_PROCESS_DATE AND .... MAX_PROCESS_DATE part of the Group By statement
If this is a wrong way to go about this task, please pardon me and suggest a better query. If it's on the right track, how would I fix it so it will run successfully?
WITH cteQUERYRANGE AS
(
SELECT MAX(PROCESS_DATE) AS MAX_PROCESS_DATE, MIN(PROCESS_DATE) AS MIN_PROCESS_DATE FROM
(
SELECT DISTINCT PROCESS_DATE FROM PAYMENTS
ORDER BY PROCESS_DATE DESC
FETCH FIRST 14 ROWS ONLY
)
)
SELECT PROGRAM_CODE AS PROGRAM, BWE_DATE AS "BWE DATE", PROCESS_DATE AS "PROCESSED DATE", GROSS_AMOUNT AS ENTITLEMENTS, FPUC, LWA
FROM PAYMENTS
WHERE PROCESS_DATE >= MIN_PROCESS_DATE AND PROCESS_DATE <= MAX_PROCESS_DATE
GROUP BY PROGRAM_CODE, BWE_DATE, PROCESS_DATE, GROSS_AMOUNT, FPUC, LWA
ORDER BY PROCESS_DATE DESC;

Answer 1

To me, it looks like this (see 3 comments within code):
WITH ctequeryrange AS(SELECT MAX(process_date) AS max_process_date,
MIN(process_date) AS min_process_date
FROM(SELECT DISTINCT process_date
FROM payments
ORDER BY process_date DESC
FETCH FIRST 14 ROWS ONLY)
)
SELECT DISTINCT program_code AS program, --> distinct
bwe_date AS "BWE DATE",
process_date AS "PROCESSED DATE",
gross_amount AS entitlements,
fpuc,
lwa
FROM payments cross join ctequeryrange --> cross join
WHERE process_date >= min_process_date
AND process_date <= max_process_date
ORDER BY process_date DESC; --> no group by
if you want to use columns from a CTE, you have to "reference" it, somehow. As it returns only one row, cross join is safe
as there are no aggregates in your query, no need to GROUP BY - DISTINCT would do
Though, your fetch first 14 rows won't result in 14 rows (if that was your intention) as CTE itself returns only one row.