Can't file a VAT return

I have used Quickfile before to file a VAT return and it is so easy to use. Sadly I seem to be unable to use it now as for just one VAT period I filed manually and not via Quickfile.
I just tried to do one for the quarter and even though I have reset the VAT start date to 01/12/2016 it calculates it all correctly but when I tried to submit I get a message in red saying I need to file the Sept 2015 period first!
Any ideas how I get around this?

Hi @Paul_Stewart

The return you’ve submitted externally will need to be created in QuickFile as it doesn’t allow blank periods. Once you’ve created it (but don’t submit it), it should then allow you to file the required quarter without any issues.