Voucher Build - "Delete All" button

Hello,

When is the "Delete All" check box available on Voucher Build Errors page? Navigation : Accounts Payable, Batch Processes, Vouchers, Voucher Build, Build Errors.

PeopleBooks states the function of it but not does not mention when it gets activated -

Delete All

Click this button to delete all returned rows from the staging table. After delete, this grid will become invisible.

Thanks in advance,

Raghu