We have the confirmation from Eikon Content team that "CTBTR_1 or FID 831 will be populated with the contributor's name if the RIC is a contributed RIC. <BBBBNK20YCD=R> is a composite RIC, hence REUTERS EOD is displayed". However when we tried to return the data for CTBTR_1 field of RIC BBBBNK20YCD=R, nothing returns.