This occurs when attempting to change the post date of an unposted invoice. The date that is grayed out is the same as the invoice date.
1. In General Ledger, Configuration, select Business Rules 2. Under Transactions, unmark the "Do not allow post dates to be different than transaction dates in other Blackbaud systems" checkbox. 3. In Accounts Payable, Records, Invoices, open the invoice 4. Change the invoice to Do Not Post and Save and Close. 5. Open the invoice again and change the invoice to Not Yet Posted. 6. Click Save and Close. 7. Open the invoice again and enter the correct post date for the invoice. 8. After changing the voices, mark the Business rule in General Ledger again if necessary.