services for which these capacities are required (i.e. the latter will assume the  role of subcontractors).    Relying on the capacities of other entities is only necessary when the capacity of the  tenderer is not sufficient to fulfil the required minimum levels of capacity. Abstract  commitments that other entities will put resources at the disposal of the tenderer will be  disregarded.  Economic operators may submit one tender. In case an economic operator submits more than  one tender (as sole tenderer and/or as a joint tenderer in a group of tenderers) without  withdrawing any of them, as foreseen in the Invitation to Tender, only the latest tender  submitted before the time limit for receipt of tenders will be considered. In case of omissions  in the latest submission, tenderers will not be able to refer to earlier submissions and may be  rejected if mandatory information is missing.  2.5. Tender submission: how many tenders may an economic operator  submit? 16