Organizations have the ability to configure constituent duplicate checking in batch. Users are finding that when they receive the exception stating a constituent record in the batch may be a possible duplicate that they receive this error after checking the option to add the constituent as a new record when validating the batch:
Cannot insert duplicate key row in object 'dbo.BATCHIGNOREDUPLICATE' with unique index 'UIX_BATCHIGNOREDUPLICATE_BATCHID_ROWID_CONSTITUENTID'. The duplicate key value is (GUID, GUID, <NULL>). The statement has been terminated.
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.