Accrual balance issue

Summary:

As an example PO was incorrectly raised with tax . The value was £10,000 plus £2,000 tax

It was receipted for £10,000 , for £10,000 debiting £12,000 to expenses and crediting accruals

The PO was changed to remove the tax for a new value of just £10,000

The invoice has posted for £10,000 leaving the £2,000 tax amount from the original receipt as a debit balance on expenses and credit balance on accruals

As the receipt wasn’t updated before the PO was changed what is the process now for removing the £2,000 debit on expenses and credit in accruals?

Can you please suggest the how we can clear this , any rule condition if we can use ?