create table t1(id1,value) as select 1,1 from dual;
create table t2(id2,id1,value) as select 1,1,1 from dual;
create table t3(type,value) as select 'T1',1 from dual;

select *
from t1
join t2 on t2.id1 = t1.id1
left join t3 on type = 'T1' and t1.value = t3.value or type = 'T2' and t2.value = t3.value;

SELECT "T1"."ID1"                   "ID1",
       "T1"."VALUE"                 "VALUE",
       "T2"."ID2"                   "ID2",
       "T2"."ID1"                   "ID1",
       "T2"."VALUE"                 "VALUE",
       "VW_LAT_024544ED"."ITEM_1_0" "TYPE",
       "VW_LAT_024544ED"."ITEM_2_1" "VALUE"
  FROM "T1" "T1",
       "T2" "T2",
       LATERAL((SELECT "T3"."TYPE" "ITEM_1_0", "T3"."VALUE" "ITEM_2_1"
                 FROM "T3" "T3"
                WHERE "T3"."TYPE" = 'T1'
                  AND "T1"."VALUE" = "T3"."VALUE"
                   OR "T3"."TYPE" = 'T2'
                  AND "T2"."VALUE" = "T3"."VALUE"))(+) "VW_LAT_024544ED"
 WHERE "T2"."ID1" = "T1"."ID1"

SQL> select *
  2  from t1, t2, t3
  3  where t2.id1 = t1.id1
  4  and type(+) = 'T1' and t1.value = t3.value(+) or type(+) = 'T2' and t2.value = t3.value(+);
and type(+) = 'T1' and t1.value = t3.value(+) or type(+) = 'T2' and t2.value = t3.value(+)
                                                                             *
ERROR at line 4:
ORA-01719: outer join operator (+) not allowed in operand of OR or IN

select *
from t1, t2, t3
where t2.id1 = t1.id1
and (case when type(+) = 'T1' and t1.value = t3.value(+) or type(+) = 'T2' and t2.value = t3.value(+) then 1 end = 1);

select *
from t1
join t2 on t2.id1 = t1.id1
left join t3 on
(case when type = 'T1' and t1.value = t3.value or type = 'T2' and t2.value = t3.value then 1 end = 1);

SELECT "T1"."ID1"   "ID1",
       "T1"."VALUE" "VALUE",
       "T2"."ID2"   "ID2",
       "T2"."ID1"   "ID1",
       "T2"."VALUE" "VALUE",
       "T3"."TYPE"  "TYPE",
       "T3"."VALUE" "VALUE"
  FROM "T1" "T1", "T2" "T2", "T3" "T3"
 WHERE CASE
         WHEN (("T3"."TYPE"(+) = 'T1' AND "T1"."VALUE" = "T3"."VALUE"(+)) OR
              ("T3"."TYPE"(+) = 'T2' AND "T2"."VALUE" = "T3"."VALUE"(+))) THEN
          1
       END = 1
   AND "T2"."ID1" = "T1"."ID1"

decode(type(+),'T1',t1.value,'T2',t2.value) = t3.value(+)

type = 'T1' and t1.value = t3.value or type = 'T2' and t2.value = t3.value