Revenue in incorrect period

 Hi,

customer missed to use Accrue through- date  in his revenue generation, and now the revenue is generated into incorrect period (May-2009)

I flagged the expenditures to regenerate revenue, but it did not help, because the adjustment and the correction were generated into the same period (Apr-2009), and the original revenue still existing in the incorrect period (May-2009).t

How can I correct the revenue?

Thanks in advance

Seija