What suffix must be added to all new typecodes in extension typelists?

When creating new typecodes in extension typelists within Guidewire, it is essential to follow naming conventions that help to differentiate them from standard typecodes. The suffix "_Ext" is specifically designated for typecodes added to extension typelists. This ensures that the typecodes are clearly marked as extensions, facilitating better organization and understanding of the codebase. Using this suffix also helps prevent potential naming collisions with existing typecodes, as it indicates that the typecode is part of the extended functionality rather than the core application.

Other options such as "_Code," "_Type," or "_List" do not align with the established naming conventions for extension typelists. They might suggest different functionalities or types of classifications within the system but are not acceptable suffixes for indicating that a typecode encompasses extended capabilities. Therefore, suffixing with "_Ext" is critical for maintaining clarity and adherence to Guidewire's development standards.