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## 9.21 Customizing Existing LOV Fetch Result

This topic provides the systematic instructions to perform the basic operations on the Customizing Existing LOV Fetch Result.

Modifying the retrieval output of an existing LOV to meet specific requirements.

- Ins cope Data segment can be used for addition of new fields. (using jquery, at any position, we can add the field).
- Service Extensibility to be used for overriding the base method, OBX tool will generate the base service jar from base service war and this jar should be used to override the base service method and implement the custom changes.
- From UI, call will go to custom service , from custom service, call will go to base service for base field persistence as Java to Java call, then custom functionality to be implemented for persistence of custom fields as part of REST call to another custom service.
- For LOV data, custom projection service to be written. Custom Event needs to be raised while custom fields persistence. For base fields, a call can be made from projection service to base service to fetch data and persisting over the projection schema.

Parent topic: Extensibility Use Cases for OBX