Box 7 is not so important as 1 & 4 but if you have correctly set up the vat codes and more importantly the vat items then the vat period will be correct.

There should not be any adjustment unless you mean to past period already filed and HMRC would now be aware of .

Or are you saying that the changes to correct vat codes have resulted in an exception report where all the correction have posted through to current period skewiing the box 7 figure.

If so then the vat exception report will also have posted the zero figures to the other boxes notifying, HMRC of the issue would be all that is necessary as the exception report is available for proof.