Typically this error message is caused by a file not being synchronized with QuickBooks successfully. I'd recommend that you go to the Utilities menu > Synchronize List Files with QuickBooks, and check the option for All Files. Then, click Synchronize. If there are any files that it can't synchronize successfully, it will generate a report letting you know which files they are. After all files have been synchronized successfully, try entering the bill again as you had previously.