In the context of AMDP, what does the 'Changing' parameter category signify?

The 'Changing' parameter category in the context of AMDP (ABAP Managed Database Procedures) is designed for parameters whose values can be modified during the execution of the procedure. When a parameter is defined as 'Changing', it allows the procedure to pass data in both directions: incoming data can be modified within the procedure and then returned to the calling program with the updated values. This category is particularly useful in scenarios where the procedure needs to perform calculations or transformations on the passed data.

In contrast, the other categories serve different purposes. Parameters defined as constant do not change during the procedure execution, while those used exclusively for data retrieval do not alter the input values. Additionally, parameters that are not utilized would simply not be part of the function and thus wouldn't contribute any value to the operation being performed.