EBS Form级联应用

form 中item关联控制代码
 app_field.set_dependent_field(event,
                (:invoices_qf.vendor_id is not null or
                 :invoices_qf.invoice_num is not null or
                 :invoices_qf.invoice_type_lookup_code is not null or
                 :invoices_qf.invoice_date_low is not null or
                 :invoices_qf.invoice_date_high is not null or
                 :invoices_qf.invoice_amount_low is not null or
                 :invoices_qf.invoice_amount_high is not null or
                 :invoices_qf.batch_id is not null or 
                 :invoices_qf.voucher_num_low is not null or
                 :invoices_qf.voucher_num_high is not null or
                 :invoices_qf.approval_status_lookup_code is not null),
                'invoices_qf.approval_status_lookup_code');
意思是 上面字段只能不为空 才能输入approval_status_lookup_code字段 要不然approval_status_lookup_code字段不允许输入