[GNC] Bank account reconciled, will this change screw things up?

[Dr. David Kirkby]

I paid for some postage for £12.54, but instead  of sticking the expense
account as Postage, I put Payroll - well, then do both begin with P. Given
I have reconciled the bank account, is it dangerous to change the account
this transaction is debited to, from Payroll to Postage? I was thinking of
unposting it, changing the expense account, then paying the invoice again.
The amount of money is unchanged.