How do I check which adjustments still need reversing?

You can view all outstanding adjustments on the creditors and debtors screen in the adjustments module.

Then select the type of creditor or debtor from the drop-down menu.

Any adjustment requiring reversal has a reversal button (two-way arrow) to the right of it.

If you use the detailed dashboard view as opposed to the process flow, view the number of outstanding adjustments is recorded in the Overview tab. 

To help you better understand the Adjustments module as a whole, please visit the module overview page here.