Campaign Start Dates

A couple of our 09-10 campaigns were created earlier this year with start dates prior to 07-01-09 as we received gifts/pledges for the upcoming fiscal year. These campaigns temporarily had a fund associated with them, a gift/pledge posted to them and then afterwards the fund was disassociated with the campaign. I now want to change the start date for these campaigns to 07-01-09. Will this create any problems with the gifts/pledges already posted to these campaigns?