https://help.myob.com/wiki/x/wC6EAQ
Accountants Enterprise only
Suppliers whose entries have been closed, but not deleted, may subsequently be re-opened.
Find and open the supplier. See Finding and opening suppliers.
Ensure that you select the Include Closed Suppliers option on the Find Suppliers page.
Click OK or press [Enter]. The search results are displayed. The list includes closed suppliers.
Double-click the supplier record you want to re-open. The Supplier page opens.
Click Re-open supplier on the Tasks bar. The supplier is re-opened.
Finding and opening suppliers
Changing suppliers’ names and codes
Changing suppliers to contacts
Closing suppliers
Deleting suppliers
Re-opening suppliers
Using the Supplier page