quickbooks VAT

Hello.
I had a short period of 2 months to change the VAT quarters.

On Quickbooks the VAT return is showing a ‘VAT amount not assigned a line on your VAT return’ error of £xxx.xxp which is the amount I paid in February for that two month (Dec/Jan) period.

I’m not sure what I need to adjust on the ‘Move to VAT line’?

Sorry. Hope this isn't too vague. I'm lost with QB.