Secondary/Consolidation Ledger: Volume/Complexity of Account Mappings

Good day, A secondary /consolidation ledger which uses the same calendar and currency as the source ledger but with a different chart of accounts has been created. The source ledger chart of accounts contains 5 segments while the target ledger uses 6 segments. The philosophy behind the chart of accounts is significantly different therefore 553 lines of account to account mapping rules have been created with a segment rule to catch any accounts not mapped. The consolidation process and the secondary ledger process both ignore the account mapping rules and uses the default segment rule.Is the volume of mapping rules