Weird Date Problem in SQL Query

Question

Dear Members,
Iam using the following query:
SQL>select api.attribute2 PO_NO,
substr(api.attribute4, 10, 5) REL_NO,
api.invoice_num,
SUM(T.ACCOUNTED_DR) DR,
SUM(T.ACCOUNTED_CR) CR
from gl.gl_je_lines t, GL_CODE_COMBINATIONS GCC, ap_invoices_all api
WHERE T.SET_OF_BOOKS_ID IN (7)
AND TO_DATE(TO_DATE(t.PERIOD_NAME, 'MON-YY'), 'DD-MON-YY') =
TO_DATE(TO_DATE('&P_PERIOD_FROM', 'MON-YY'), 'DD-MON-YY')
AND TO_DATE(TO_DATE(t.PERIOD_NAME, 'MON-YY'), 'DD-MON-YY') <=
TO_DATE(TO_DATE('&P_PERIOD_TO', 'MON-YY'), 'DD-MON-YY')
AND T.CODE_COMBINATION_ID = GCC.CODE_COMBINATION_ID
AND GCC.SEGMENT5 = '&P_ACCOUNT'
and t.reference_2 = api.invoice_id
GROUP BY api.attribute2, substr(api.attribute4, 10, 5), api.invoice_num
order by api.attribute2, substr(api.attribute4, 10, 5), api.invoice_num
In the above query iam giving two types of parameters:
Type1:
Account:=17400650
P_PERIOD_FROM:='JAN-07'
P_PERIOD_to:='DEC-07'
For the above type of parameters the query is running fine and giving desired results.
Type2:
Account:=36210040
P_PERIOD_FROM:='JAN-07'
P_PERIOD_to:='DEC-07'
For the above type of parameters it is giving me the error: ora-01843 not a valid month_
Can any one please tell me what is the reason for this weird problem.
Your inputs will be of great help to me.
Thanks in advance.
Best Regards,
Arun Reddy

Answer 1

Please review Note:338832.1
How to debug ORA-01843: not a valid month, ORA-01821: date format not recognized, ORA-1801