Ora 00918 normalizing problem using cartesian product

I am using a cartesian product to normalise a table. Is there a better way of doing this to avoid the 00918 error?
Thanks in advance ...
select
/* select clause */
from
z_dvo_proj_milestone_summary t1,
z_dvo_proj_milestone_summary t2
where
/* where clause */
create or replace view z_dvo_proj_milestone_summary as
select
query1.projid
,query1.projname
,query1.projtype
,query1.projcode
,query1.report_month
,query1.report_year
,query1.SubProjID
,query1.DVONUM
,query1.measure_type
,query1.MEASURE
,hier.level0_vosa_prj_type
from
(select
score.project as projid
,srm.name as projname
,hier.level0_vosa_prj_type as projtype
,score.code as projcode
,score.report_month as report_month
,score.report_year as report_year
,CASE
when (subprojtab.subprojid = 1) then score.sub_project_1
when (subprojtab.subprojid = 2) then score.sub_project_2
End as SubProjID
,dvonumtab.dvonum as DVONUM
,typetab.measure_type as measure_Type
,CASE
WHEN (subprojtab.subprojid = 1) then
CASE
when typetab.measure_type = 'baseline' then
CASE
when (dvonumtab.dvonum = 1) then score.proj1_dvo1_baseline
when (dvonumtab.dvonum = 2) then score.proj1_dvo2_baseline
End
when typetab.measure_type = 'planned' then
CASE
when (dvonumtab.dvonum = 1) then score.proj1_dvo1_planned
when (dvonumtab.dvonum = 2) then score.proj1_dvo2_planned
End
End
WHEN (subprojtab.subprojid = 2) then
CASE
when typetab.measure_type = 'baseline' then
CASE
when (dvonumtab.dvonum = 1) then score.proj2_dvo1_baseline
when (dvonumtab.dvonum = 2) then score.proj2_dvo2_baseline
End
when typetab.measure_type = 'planned' then
CASE
when (dvonumtab.dvonum = 1) then score.proj2_dvo1_planned
when (dvonumtab.dvonum = 2) then score.proj2_dvo2_planned
End
End
End as MEASURE
from
ODF_CA_PROJSCORE score
left outer join
srm_projects srm on (srm.id = score.project)
left outer join
Z_PROJECT_HIERARCHY hier on (srm.id = hier.level0)
Join
(select 1 as subprojid from dual
union
select 2 as subprojid from dual) subprojtab on (1=1)
/* There will be 11 measures here eventually */
Join
(select 'baseline' as measure_type from dual
union
select 'planned' as measure_type from dual) typetab on (1=1)
Join
(select 1 as dvonum from dual
union
select 2 as dvonum from dual) dvonumtab on (1=1)
WHERE
(CASE
when (subprojtab.subprojid = 1) then score.sub_project_1
when (subprojtab.subprojid = 2) then score.sub_project_2
End) IS NOT NULL) query1
left outer join Z_PROJECT_HIERARCHY hier
on (query1.SubProjID = hier.level0)

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Ora 00918 normalizing problem using cartesian product

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