Many brokers did not code their CTM interface to view unmatched blocks sent by an investment manager. As a workaround, some investment managers sent files away from CTM, duplicating data already present in CTM, creating redundancies and additional manual effort. Once the CTM Broker has setup a View Only Broker (VOB), an investment manager, or the ITP Service Bureau on their behalf, needs to add the VOB to the relevant Broker Matching Group (BRMG). As soon as the VOB is added, the broker can view unmatched alleged blocks. This transparency brings greater efficiency to trade confirmation, especially when the investment manager is splitting their blocks.
Learn more about block splitting in this guide: CTM: FAQs: What is Block Splitting?