Why Groovy Script Needed in SAP CPI?

 Groovy scripting is used in Script Steps in SAP CPI to:

1. Customize Message Processing 

Perform operations like conditional routing, dynamic value assignments, or advanced validation based on message content.

2. Manipulate Payloads

 Read, modify, or generate payloads in XML, JSON, or CSV. 

 Convert from one format to another (e.g., CSV to XML, JSON to XML).

3. Access and Modify Headers/Properties/Attachments

You can read and write message headers, properties, or dynamic configuration values (useful for authentication, tokens, etc.).

4. Create Custom Logging 

For debugging and monitoring purposes, custom logs can be written.

5. Handle External API Calls or Calculations

You can fetch external data (if allowed) or perform complex mathematical or date calculations.