3745547 - Check for duplicate lockbox files - SAP S/4HANA Cloud Public Edition

• When multiple lockbox files with identical content are received on the same day, only one should be processed and duplicates should be rejected with an error.
• Observed error message: “Information Header record &: List with identical key already exists in the system (DD.MM.YYYY).” 

SAP S/4HANA Cloud Public Edition

1. Upload two lockbox files in BAI2 format containing identical payment content on the same calendar day.
2. Observe the expected behavior: the first file processes; the duplicate is rejected with a duplicate error.
3. Repeat on a different day with two files that carry the same payment content but have different BAI2 header timestamps.
4. Observe that both files are processed successfully.

The system performs duplicate checks using the BAI2 file header; when the headers (for example, timestamps) differ, the files are treated as unique and allowed to import.

1. Review the BAI2 headers of the files to confirm whether the header fields used for duplicate checking (including the timestamp) are identical.
2. If the headers differ, the system will import both files by design; this behavior is correct and no error is raised.

Refer: Format Description for Lockbox Batches

Refer: Format Description for Lockbox Batches

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