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OCI-01862:

wrong number of digits for this format item
Cause: The number of digits used for this format item is not equal to the number necessary for this format when specifying Format eXact ("FX") for this item.
Action: Fill out this format item with leading zeros to the number necessary for this format. (This is generally the number of characters in the format code--DD needs 2 digits, for example. The exceptions are HH24 & HH12, which both need 2, and J, which needs 9.)