scope:

This document was prepared to complement Part 1, with the reverse engineering guidelines explaining how to extract relevant information from existing IndustryMessageSets in order to prepare the submission to the ISO 20022 Registration Authority of equivalent, ISO 20022 compliant BusinessTransactions and MessageSets. The ISO 20022 Repository will contain all ISO 20022 compliant BusinessTransactions and MessageSets, as outlined in Part 1. The approach that must be followed to add ISO 20022 compliant BusinessTransactions and MessageSets to the Repository can be classified as follows. . Case 1: No ISO 20022 compliant BusinessTransactions and MessageSets exist No IndustryMessageSet exists . Example: Collective Investment Vehicles . Approach: full development of ISO 20022 compliant BusinessTransactions and MessageSets using Part 3. . Case 2: No ISO 20022 compliant BusinessTransactions and MessageSets exist One or more IndustryMessagesets exist . Example: Securities Pre-Trade (FIX MessageSet exists) . Approach: conversion of the IndustryMessageSet(s) into ISO 20022 compliant BusinessTransactions and MessageSets, using Part 5. . Case 3: ISO 20022 compliant BusinessTransactions and MessageSets exist One or more existing IndustryMessageSets exist as well . Example: Securities Post-Trade (FIX, Omgeo MessageSets exist) . Approach: comparison of the existing IndustryMessageSet(s) with the ISO 20022 compliant BusinessTransactions and MessageSets and extension of the ISO 20022 compliant BusinessTransactions and MessageSets as necessary, using Part 5. This document describes the activities of ISO 20022 reverse engineering from the point of view of the user who wants to verify that the business functionality, covered by his own IndustryMessageSet, is covered by ISO 20022 compliant BusinessTransactions and MessageSets. The document is not an attempt to define a "methodology" for reverse engineering. It describes the following set of required activities: . extract relevant information from existing IndustryMessageSets and compare it to the related information in the ISO 20022 Repository;