The only time this message is returned is where the dates that you are filing a return for do not agree with the records that HMRC hold.

The most common cause of this is where you have just miskeyed one of the dates, for example you have put the end date as the 30th December, rather than the 31st. You will need to check the dates, amend them in your source file, then relink across to the VAT filer so the values then update and try the submission again.

Before resubmitting, please also check the dates you are filing for are in the format of dd/mm/yyyy, and that you have the regional settings on your machine set to English UK and dates dd/mm/yyyy.