Wonder if anyone can help with a vat quarter end problem on pegasus opera II -

I have ran the vat quarter 1/5/12 to 31/7/12, printed off all the reports and return, clicked on the vat commit data box and done the period ends for July of NL/PL & SL.

Yet when I went back into the vat, it still shows 1/5/12-31/7/12 with the 1/5/12 greyed out and the vat commit box greyed out.

I was hoping it would have shown the start date now as 1/8/12

Can anyone assist..