Which language is used to add or change data of a business object in RAP?

Comprehensive and Detailed Explanation from Exact Extract:

In RAP, changes to business object data are performed using Entity Manipulation Language (EML).

It provides ABAP statements such as READ ENTITIES, MODIFY ENTITIES, CREATE, and DELETE for RAP BOs.

EML is the cloud-compliant equivalent of SQL DML (insert/update/delete) but tailored to RAP’s transactional consistency.

Verified Study Guide Reference: RAP Programming Model – Entity Manipulation Language (EML).