What predicate condition is used to ensure a successful CAST in ABAP?

In ABAP, the predicate condition that ensures a successful CAST is "IS INSTANCE OF." This condition is used to check if a reference variable points to an instance of a specified class or its subclass, which is a crucial step before performing a CAST operation. When you use CAST in ABAP, it’s important to first verify that the object being cast is indeed an instance of the expected class type.

By utilizing the "IS INSTANCE OF" condition, developers can safely perform the cast, knowing that they are working with a compatible object type. If this check is not adequately performed, it could result in runtime errors or unexpected behavior due to incompatible object types being accessed.

The other options pertain to different types of checks but do not specifically validate the compatibility necessary for a safe CAST operation. For example, "IS SUPPLIED" checks if a parameter was provided, "IS BOUND" verifies if an object reference is not null, and "IS NOT INITIAL" checks if a variable has been initialized to a non-default value, but none of these focus solely on the class inheritance relationship required for proper casting in ABAP.