their accounts on the expenditure that was incurred, during the relevant reference period as defined in sector-specific rules, in the execution of their tasks and that was presented to the Commission for reimbursement;
a gcuntais maidir leis an gcaiteachas a tabhaíodh, le linn na tréimhse ábhartha tagartha de réir mar a shainmhínítear i rialacha earnáilsonracha, i bhfeidhmiú a gcúraimí agus a tíolacadh don Choimisiún le haghaidh aisíocaíochta;