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And of course using the dates on the setup (G/L and A/L) to prevent users from posting at past or future dates... Let them enter what they imagine... The system will throw it back to their faces... :evil:
As for changing the data, if it is not at a ledger (or affects ledger entries), then you can go through the object designer, run the table, locate the record and modify the value... But with caution... Think twice*twice*twice before changing something...
But these test the posting date. Not the Document date, order date, shipment date,...