[Koha] Fwd: Serial > Claim > Vendor selection : Check box missing

Please kindly help me to solve the problem In serial> Claims: in Selection Late list, I cannot select more than one vendor (checks box missing) to ‘Export selected item data’ But Manual shows there are check box to do the selction http://manual.koha-community.org/3.4/en/serialclaims.html <http://manual.koha-community.org/3.4/en/serialclaims.html> But in My version ( Koha 3.12.01.000) Cannot see the check box to do the selection. Please help me to solve the case. Thanks in advance Harsha Balasooriya Open University - Sri Lanka