You are using a Data Store Operation of the type Write.

The Data Store in SAP Cloud Integration stores key-value pairs. Let’s find the parameter to prevent duplicates:

Step 1: Write Operation- The "Write" operation stores a message in the data store with a specified Entry ID (key).

Step 2: Duplicate Handling- By default, if an Entry ID exists, a duplicate entry error occurs unless overridden.

Step 3: Evaluate Options-

A. Overwrite Existing Message: Correct; when checked, it replaces an existing entry with the same ID, avoiding duplicate errors.

B. Include Message Headers: Adds headers to the stored data, unrelated to duplicates.

C. Encrypted Stored Message: Encrypts data, not tied to duplicate prevention.

D. Retention Threshold for Alerting: Sets expiration alerts, not duplicate control.

Step 4: Configuration- In the "Data Store Operations" step, selecting "Write" and enabling "Overwrite Existing Message" ensures updates rather than duplicates.

Step 5: Official Verification- The SAP Help Portal’s "Defining Data Store Operations" states that "Overwrite Existing Message" prevents duplicate entry exceptions by updating existing IDs.

Conclusion: Option A is 100% verified per SAP documentation.References:

SAP Help Portal: "Defining Data Store Operations" (SAP Cloud Integration)

SAP Cloud Integration Documentation: "Data Store"