The Application field of an Enhanced Revenue batch is grayed out when a constituent's payment is applied to a 3rd party commitment. Typically when a payment is applied to the commitment of the constituent making the payment, this information will be displayed in the Application field of the batch.
Note this issue only occurs in the Click Once environment. The information is correctly displayed in the Application field in Web Shell.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.