The language ID used by Modular Messaging Release 2 for Latin American Spanish is the same as the language ID used by Modular Messaging Release 3 for Castilian Spanish.
If both a Modular Messaging Release 2 system and a Modular Messaging Release 3 system are connected to the same Message Networking system, and the Modular Messaging Release 2 system sends an LDAP update that includes language IDs for subscribers using Latin American Spanish, those subscribers' Language IDs will be incorrectly set for Castilian Spanish on the Message Networking system.