While saving a requisition when you will get the following message appears PO_ALL_POSTING_NA
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No valid code combination for the accounts defaulting in distribution account
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Issue in the Workflow of Account generator
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Flex field qualifier has not been setup properly
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None of the above
PO_ALL_POSTING_NA means 'Posting Not Available' and occurs when there's no valid code combination for the defaulting distribution account. This is an account validation error, not a workflow issue (B) or flexfield setup problem (C). The system cannot post because the account combination doesn't exist or is inactive.
PO_ALL_POSTING_NA appears when Oracle cannot find a valid Accounting Flexfield combination for the distribution account that the Account Generator is trying to default onto the requisition or PO distribution line. It's a data/setup issue (missing or invalid code combination), not necessarily a workflow bug or a flexfield qualifier problem, though those can sometimes be contributing causes — the core message itself points to the missing valid combination.