How can i reverse this transaction

Hi everyone,

Please i need help on how to reverse this transaction.

1.A user created an event from Oracle project billing using 5-Jan-2015 as invoice date and 1-Sep-2015 as GL date.

2.The invoice was Interfaced to Receivables using the same dates as stated above.

3.User changed the Invoice date to 5-Jan-2016 but left GL date as 1-sep-2015 in receivables and interfaced to GL.

4.User changed GL date to 5-Jan-2016 In GL.

The implication of this is that when an invoice is created the following accounting entries are created

DR...Receivables

CR..Deferred Revenue account

CR...VAT

when the revenue is recognized ( from project billing) which is usually in the same period (5-jan-2016) the following entries are created