If a Sales Invoice that was created in Xero gets rejected by an Approver, it goes back to Xero in the Draft status. Its Requester needs to amend the Sales Invoice in Xero and then resubmit it for approval.
If a Sales Invoice that was created in ApprovalMax gets rejected by an Approver, it can be amended, revoked, copied, cancelled, or its approval can be forced.
Administrators can force the approval of rejected Sales Invoices:
Requesters can edit Sales Invoices and resubmit them for approval.