This is due to a Business Rule which allows users to ensure that the transaction date and the post date are the same when posting from other Blackbaud Systems.  With this Business Rule marked, the Payment Post date field will be grayed out when Printing Checks and Recording Bank Drafts in the Bank or when creating Payments and Charges.  To change this Business Rule:

  1. In General Ledger, Configuration, Business Rules, highlight Transaction.
  2. Unmark the checkbox next to Do not allow post dates to be different than transaction dates in other Blackbaud Systems.