Right GROUP BY clause

Question

I wrote the view in the Original View section below. I query it with the following SELECT statement:
SELECT *
FROM ZZBUD_DEBT_SERVICE_V
WHERE action_month IN ('01','02')
AND action_year IN ('2011')
AND short_name IN( 'WHIT-18','2REDFERN')
ORDER BY action_year,action_month, group1, group2, short_name;
An get these results:
SHORT GROUP1 GROUP2 ACTION ACTION CURR CURR CURR
NAME YEAR MONTH INT INT PRIN
ACCRUED PAYMENT PAYMENT
2REDFERN     05     02 2011 01     149.39     0     0     
2REDFERN     05     02 2011 02     0     896.32 49795.84     
WHIT-18     05     01 2011 01     442.86     0     0     
WHIT-18     05     01 2011 02 442.86 2657.14 0     
I need to compute the year-to-date CURR_INT_ACCRUED, CURR_INT_PAYMENT, CURR_PRIN_PAYMENT (SUM(CURR_INT_ACCRUED), etc.) by short_name and action_year but I can't tweek my GROUP BY statement properly. What would the GROUP BY expression look like to get the sum of these columns?
Original View:
CREATE OR REPLACE VIEW ZZBUD_DEBT_SERVICE_V(short_name, group1, group2, action_year, action_month
, curr_int_acrrued, curr_int_payment, curr_prin_payment)
AS
SELECT short_name, group1, group2, action_year, action_month
, SUM(curr_int_acrrued) curr_int_acrrued
, SUM(curr_int_payment) curr_int_payment
, SUM(curr_prin_payment) curr_prin_payment
FROM (
SELECT dsa.short_name
, dsa.group1
, dsa.group2
, dsa.action_year
, dsa.action_month
, DECODE(SIGN(dsa.int_accrued),-1,0 ,0,0,dsa.int_accrued) curr_int_acrrued
, DECODE(SIGN(dsa.ytd_accrued),1,0,0,0,ABS(dsa.ytd_accrued)) curr_int_payment
, DECODE(SIGN(dsa.bond_outstand),1,0,0,0,ABS(dsa.bond_outstand)) curr_prin_payment
FROM NYC.ZZBUD_DEBT_SERVICE_MASTER DSA
WHERE dsa.bond_status = 'A'
AND dsa.group1 IN ('03', '05', '06', '07')
ORDER BY dsa.group1, dsa.group2, DSA.short_name, dsa.action_year, dsa.action_month
GROUP BY short_name,group1,group2,action_year,action_month

Answer 1

It depends on how you look at it. When I issue the command:
SELECT group1, group2, short_name,SUM(curr_int_acrrued) ytd_accrued_int
FROM ZZBUD_DEBT_SERVICE_V
WHERE action_month IN ('01','02')
AND action_year IN ('2011')
AND short_name IN ('BXRIVER','WILSON','WHIT-18','2REDFERN')
GROUP BY action_year,action_month,group1, group2, short_name
ORDER BY action_year,action_month, group1, group2, short_name
I'm not getting the results I want as 'WHIT-18' shows detail for both action_months and I want the SUM of 01 & 02 and the same for the other short_names. When I drop columns from the GROUP BY clause I get error ORA-0979 'Not a GROUP BY expression'.