Issue With GROUP BY In Query - oracle

Question

First of all, thanks in advance for any help anyone can offer!
I'm fairly new to Oracle, so I apologize if this question is stupid...
I'm having an issue getting a query to run properly, and the issue is with the GROUP BY clause in the query.
When running the query, I get the error stating that it's not a GROUP BY statement?? Not really sure what that means.
Here is the query:
with SUB_GRP_LVL_1 as
(
select sg.HCC_ID,sge.SUB_GROUP_NAME
from XXXX_ODS.GROUP_T g
Join XXXX_ODS.SUB_GROUP sg
on g.GROUP_KEY=sg.GROUP_KEY
and g.HCC_ID NOT IN('A0002','A0003','A0004','A0005','A0021','A0022','A0041','A0042','A0081','A0121','A0061')
and sg.REC_SRC_CD='HS1'
and sg.LEVEL_NBR=1
join XXXX_ODS.SUB_GROUP_EFF sge
on sge.SUB_GROUP_KEY=sg.SUB_GROUP_KEY
---and sge.CURRENT_INDC=1
and sge.ACTIVE_INDC=1
)
,
SUB_GRP_LVL_2 as
(
select sg.HCC_ID,sge.SUB_GROUP_NAME
from XXXX_ODS.GROUP_T g
Join XXXX_ODS.SUB_GROUP sg
on g.GROUP_KEY=sg.GROUP_KEY
and g.HCC_ID NOT IN('A0002','A0003','A0004','A0005','A0021','A0022','A0041','A0042','A0081','A0121','A0061')
and sg.REC_SRC_CD='HS1'
and sg.LEVEL_NBR=2
join XXXX_ODS.SUB_GROUP_EFF sge
on sge.SUB_GROUP_KEY=sg.SUB_GROUP_KEY
and sge.ACTIVE_INDC=1
)
,
GRP_BEN_PL_ID as
(
select sg.SUB_GROUP_KEY,bpe.HCC_BENEFIT_PLAN_ID , sgbp.EFFECTIVE_DT, sgbp.EXPIRATION_DT, pe.FUNDING_TYPE, pe.HCC_PROD_ID, pe.STATE_CD, pe.SUB_COMPANY
from XXXX_ODS.GROUP_T g
Join XXXX_ODS.SUB_GROUP sg
on g.GROUP_KEY=sg.GROUP_KEY
and g.HCC_ID NOT IN('A0002','A0003','A0004','A0005','A0021','A0022','A0041','A0042','A0081','A0121','A0061')
and g.REC_SRC_CD='HS1'
JOIN XXXX_ODS.SUB_GROUP_BENEFIT_PLAN sgbp
on sg.SUB_GROUP_KEY=sgbp.SUB_GROUP_KEY
---and sgbp.CURRENT_INDC=1
and sgbp.ACTIVE_INDC=1
join XXXX_ODS.BENEFIT_PLAN_EFF bpe
on sgbp.BENEFIT_PLAN_KEY = bpe.BENEFIT_PLAN_KEY
and bpe.ACTIVE_INDC=1
join XXXX_ods.product_eff pe
on bpe.PRODUCT_KEY=pe.product_key
and pe.ACTIVE_INDC=1
)
select
BLK_1.SUB_GROUP_KEY,ACCT_NBR AS GROUPID,
SUB_GRP_ID,
DIVISION_ID
,GRP_BEN_PL_ID.HCC_BENEFIT_PLAN_ID
,INVOICE_NBR
,'CMD' BUSTYPE,
GRP_BEN_PL_ID.FUNDING_TYPE AS BUSSUBTYPE,
GRP_BEN_PL_ID.HCC_PROD_ID AS PROCODE,
'' AS PREMIUMTYPE,
INV.CURRENT_INVOICED_AMT AS PREMIUMBILLED,
INV.CURRENT_INVOICED_AMT AS PREMIUMDUEDATE,
'' AS PREMIUMPAID,
'' AS PREMIUMAPPLYDATE,
COUNT(invl.INVOICE_LINE_KEY) AS CONTRACTSXXXXL,
'' AS MEMBERSXXXXL
--ACCOUNT_TYPE
,DECODE (UPPER(GRP_BEN_PL_ID.STATE_CD),'NEBRASKA','NE','IOWA','IA') STATE,
GRP_BEN_PL_ID.SUB_COMPANY LGL_ENTITY,
LEVEL_NBR
from
(
select
g.GROUP_KEY, sg.SUB_GROUP_KEY, g.HCC_ID ACCT_NBR,ge.GROUP_NAME ACCT_NAME,substr(sg.HCC_ID, 1,instr(sg.hcc_id,'-',1,2)-1) SUB_GRP_ID,sg.HCC_ID DIVISION_ID,ce.FIRST_EFFECTIVE_DT,
add_months(
decode(ce.EFFECTIVE_DT,TO_DATE('01/01/1800','MM/DD/YYYY'),ce.FIRST_EFFECTIVE_DT,ce.EFFECTIVE_DT),ce.RENEWAL_INTERVAL) RENVL_DT, ce.ACCOUNT_TYPE
, sg.LEVEL_NBR
from
XXXX_ODS.CUSTOMER_EFF ce
join XXXX_ODS.GROUP_T g
on g.CUSTOMER_KEY=ce.CUSTOMER_KEY
Join XXXX_ODS.SUB_GROUP sg
on g.GROUP_KEY=sg.GROUP_KEY
and g.HCC_ID NOT IN('A0002','A0003','A0004','A0005','A0021','A0022','A0041','A0042','A0081','A0121','A0061')
and g.REC_SRC_CD='HS1'
and sg.LEVEL_NBR=2
and g.HCC_ID not like 'TEST%'
join XXXX_ODS.GROUP_EFF ge
on ge.GROUP_KEY = g.GROUP_KEY
and ge.CURRENT_INDC=1
union
select
gp.GROUP_KEY,
sgp.SUB_GROUP_KEY, gp.HCC_ID ACCT,gep.GROUP_NAME, sgp.HCC_ID SUB_GRP, NULL DIVISION,cep.FIRST_EFFECTIVE_DT,
add_months(decode(cep.EFFECTIVE_DT,TO_DATE('01/01/1800','MM/DD/YYYY'),cep.FIRST_EFFECTIVE_DT,cep.EFFECTIVE_DT),cep.RENEWAL_INTERVAL) RENVL_DT,
cep.ACCOUNT_TYPE, sgp.LEVEL_NBR
from
XXXX_ODS.CUSTOMER_EFF cep
join XXXX_ODS.GROUP_T gp
on gp.CUSTOMER_KEY=cep.CUSTOMER_KEY
Join XXXX_ODS.SUB_GROUP sgp
on gp.GROUP_KEY=sgp.GROUP_KEY
and gp.HCC_ID NOT IN('A0002','A0003','A0004','A0005','A0021','A0022','A0041','A0042','A0081','A0121','A0061')
and gp.REC_SRC_CD='HS1'
and sgp.LEVEL_NBR=1
and gp.HCC_ID not like 'TEST%'
join XXXX_ODS.GROUP_EFF gep
on gep.GROUP_KEY = gp.GROUP_KEY
and gep.CURRENT_INDC=1
and not exists
(
select 'X'
from
XXXX_ODS.GROUP_T gi
Join XXXX_ODS.SUB_GROUP sgi
on gi.GROUP_KEY=sgi.GROUP_KEY
and gi.HCC_ID NOT IN('A0002','A0003','A0004','A0005','A0021','A0022','A0041','A0042','A0081','A0121','A0061')
and gi.REC_SRC_CD='HS1'
and sgi.LEVEL_NBR=2
and gi.HCC_ID not like 'TEST%'
where
gp.HCC_ID=gi.HCC_ID
and sgp.HCC_ID=substr(sgi.HCC_ID, 1,instr(sgi.hcc_id,'-',1,2)-1)
)
) BLK_1
join SUB_GRP_LVL_1
on SUB_GRP_LVL_1.HCC_ID=BLK_1.SUB_GRP_ID
left join SUB_GRP_LVL_2
on SUB_GRP_LVL_2.HCC_ID=BLK_1.DIVISION_ID
left join GRP_BEN_PL_ID
on GRP_BEN_PL_ID.SUB_GROUP_KEY=BLK_1.SUB_GROUP_KEY
LEFT Join XXXX_ODS.INVOICE inv
on inv.BILL_TO_GROUP_KEY = BLK_1.GROUP_KEY
LEFT JOIN XXXX_ODS.INVOICE_BILLING_CATEGORY invbc
on invbc.INVOICE_KEY = inv.INVOICE_KEY
LEFT JOIN XXXX_ODS.INVOICE_LINE invl
on invl.INVOICE_BILLING_CATEGORY_KEY = invbc.INVOICE_BILLING_CATEGORY_KEY
GROUP BY
GRP_BEN_PL_ID.SUB_GROUP_KEY,
ACCT_NBR, --AS GROUPID,
SUB_GRP_ID,
DIVISION_ID
,GRP_BEN_PL_ID.HCC_BENEFIT_PLAN_ID
,INVOICE_NBR
,BUSTYPE
,GRP_BEN_PL_ID.FUNDING_TYPE,
,GRP_BEN_PL_ID.HCC_PROD_ID --AS PROCODE,
,PREMIUMTYPE
,INV.CURRENT_INVOICED_AMT
PREMIUMBILLED,
INV.CURRENT_INVOICED_AMT --AS PREMIUMDUEDATE,
,PREMIUMPAID
,PREMIUMAPPLYDATE
,MEMBERSXXXXL
ACCOUNT_TYPE
,STATE_CD,
GRP_BEN_PL_ID.SUB_COMPANY,
,LEVEL_NBR
order by ACCT_NBR,SUB_GRP_ID,LEVEL_NBR,DIVISION_ID
;
Thanks!

Answer 1

NEW ANSWER BASED ON COMMENT
Sorry I should have looked a bit closer I read the statement 'I get the error stating that it's not a GROUP BY statement' saw the count and made an assumption with my original answer.
With the further information provided in the comments I think the issue is actually that you are using the column alias in the group by.
When grouping you actually have to use the field names not the alias, if you have a static value (in this case '' AS MEMBERSXXXXL) you do not need to group by it SO
incorrect select using alias in the group by
select column1, column2 || column 3 as test2, '' as test, count(1) as cnt
from table
group by column1, test2, test
correct select omitting static value and putting full field in the group by
select column1, column2 || column 3 as test2, '' as test, count(1) as cnt
from table
group by column1, column2 || column 3
ORIGINAL ANSWER BELOW
where you have a count, min, max, sum ect within your select statement you need to tell it how to group the other columns....
you have
COUNT(invl.INVOICE_LINE_KEY) AS CONTRACTSXXXXL,
This means you will need a group by clause on your select.
Good resource for basics of this is
https://www.oracletutorial.com/oracle-basics/oracle-group-by/