If the disbursement reversal is needed to free up an allocation please raise a new case online and reference the title of this article as we will need to amend the figures.
If it was just a reversal that didn't need the allocation you can correct this by doing two postings as a minus:
From the main menu go into General Postings.
Select the type either BPO/ND/PIO/BPC/BRC.
Select NEW.
Put the details in and any information you need to see in the narrative.
Put in a minus then the amount of the disbursement.
Click the Floppy Disk icon to save.
Do the same posting again.
Select POST.