8. NCBs shall transmit to the ECB the counterparty reference data for all counterparties in accordance with Section 1 of Template 1 of Annex I together with the first transmission of credit data. When a change occurs, NCBs shall update the data by no later than the transmission of credit data that is relevant for the first reporting reference date on or before which the change came into effect. Unless NCBs inform reporting agents that they have obtained updated counterparty reference data from other sources, reporting agents shall update such data by informing NCBs of any changes at the time requested by the relevant NCB, but no later than the date on which credit data is reported to the relevant NCB for the first reporting reference date following the date on which the change came into effect.