- my $edit_oe_link = build_std_url("script=oe.pl", 'action=edit', 'type=' . E($ref->{type}), 'id=' . E($ref->{trans_id}), 'callback');
+ my $edit_oe_link = build_std_url("script=oe.pl", 'action=edit', 'type=' . E($ref->{customer_id} ne '' ? 'sales_order' : 'purchase_order'), 'id=' . E($ref->{trans_id}), 'callback');