Select or update a field based on a column on another row

hi
I have some 5000 rows for the following combination of columns. Each combination has two rows. The only difference between these two rows is an indicator field. If one row for the same combination is having indicator as 'M' the other row for the same combination should ideally have indicator 'R'. But unfortunately the other row's indicator is null.
ie. if the first row for same combination of fields, indicator is 'M. then other one is null which should have been 'R'. If the first row is 'R' then other one is again null which should have been 'M'.
PRODUCT_NO STATE MONTH INDICATOR
1001 CA SEPT M
1001 CA SEPT null
1002 NY OCT R
1002 NY OCT null
Here for the first combination indicator is M and other one is null. But i need to update it to 'R' since other rows is M.
Same way for second combination first row is R second row then should have M as indicator.
Basically it is changing field to a value based on the value in the other rows indicator for the same combination of the above columns.
Please help if anybody has idea to do this in simple steps
Thanks

Is this what you are looking for?
WITH TABLE_A AS
SELECT '1001' PRODUCT_NO, 'CA' STATE, 'SEPT' MONTH, 'M' INDICATOR FROM DUAL UNION ALL
SELECT '1001' PRODUCT_NO, 'CA' STATE, 'SEPT' MONTH, null INDICATOR FROM DUAL UNION ALL
SELECT '1002' PRODUCT_NO, 'NY' STATE, 'OCT' MONTH, 'R' INDICATOR FROM DUAL UNION ALL
SELECT '1002' PRODUCT_NO, 'NY' STATE, 'OCT' MONTH, NULL INDICATOR FROM DUAL UNION ALL
SELECT '1003' PRODUCT_NO, 'LA' STATE, 'NOV' MONTH, 'R' INDICATOR FROM DUAL UNION ALL
SELECT '1003' PRODUCT_NO, 'LA' STATE, 'NOV' MONTH, 'M' INDICATOR FROM DUAL
SELECT
PRODUCT_NO,
STATE,
MONTH,
DECODE(A.INDICATOR,NULL,(SELECT DECODE(B.INDICATOR,'R','M','R') FROM TABLE_A B WHERE B.PRODUCT_NO = A.PRODUCT_NO AND B.STATE = A.STATE AND B.MONTH = A.MONTH AND B.INDICATOR IS NOT NULL), A.INDICATOR) INDICATOR
FROM
TABLE_A A

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