If you are suddenly unable to add or view multiple vouchers in BUSY Accounitng Software,if you are login as sub user,it might the reason is your user restriction,you can follow given steps:
Step 1:First,login your company in BUSY as admin user.
Step 2:Go to Administration menu,
Step 3:click users,
Step 4:Open that Sub user in modify mode,
Step 5:Go to menu rights,
Step 6:click transactions,then check the check box add or view, then save this configuration.
Step 7:After that re login to your company as sub user, then check you will access to add or view vouchers.