Refinitiv provides a RTO pricing service ( service name= ELEKTRON_DD ) and a 3sec conflated feed ( ERT_FD3_LF1 ) which is mainly used for Wealth clients to power websites or portals. The big advantage of this 3 second conflated feed is that the number of updates is limited at the source side, which makes it easier for client application to manage the load and the fan-out. The 2nd advantage is that it supports the consolidated FIDs. These consolidated FIDs make it very easy for the client developers to have the last price on a fixed FID, CF_LAST. For example, LSEG , depending on the exchange segment, the last price has to be taken from the "last order book trade price" FID, for another segment the mid price has to be taken and for another segment the TRDPRC_1. If I use RTO, there is no support for consolidated FIDS while I need the CF_-mapping logic to be sure that I take the last price from the correct FID. Can you please provide me the CF_-mapping logic that you apply in your desktop or in the 3 seconds conflated feed ( ERT_FD3_LF1 ) so I can apply the CF_-mapping logic at the client side?