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Description

This error indicates that the generated XML output data, prior to base64 encoding, is too large for the system's internal string buffer. It typically occurs when processing or exporting large volumes of data that require XML formatting and subsequent base64 encoding, exceeding defined technical limits.

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Error Message

ERR_TEXT_COMMON_INPUT_BUFFER_EXCEEDS_USTRING_LIMIT_FOR_BASE64_ENCODING

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Known Causes

3 known causes

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Excessive Data Volume

Processing or exporting a very large dataset creates an XML output buffer that exceeds the UString capacity required for base64 encoding.

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Complex XML Structure

A highly nested or verbose XML structure, even with moderate data, can result in an output buffer too large for base64 encoding.

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Inefficient Data Transformation

Suboptimal data transformation or mapping rules might generate redundant or excessively long strings within the XML, exceeding the buffer limit.

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Solutions

3 solutions available

1. Increase XML Output Buffer Size via SAP Notes medium

Apply SAP Notes that provide parameters to increase the XML output buffer limit.

1

Identify relevant SAP Notes. Search SAP Support Portal for notes related to 'XML output buffer exceeded', 'ERR_TEXT_COMMON_INPUT_BUFFER_EXCEEDS_USTRING_LIMIT_FOR_BASE64_ENCODING', and your specific S/4HANA version. Look for notes that introduce or modify profile parameters.

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2

Apply the identified SAP Notes. Follow the instructions within the SAP Notes to implement the necessary changes in your S/4HANA system. This typically involves uploading and activating the note.

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3

Configure profile parameters. After applying the notes, you may need to set or adjust profile parameters. The most common parameter is `icm/max_request_size_KB`. Increase this value in your instance profile (RZ10). The exact parameter name and recommended value will be specified in the SAP Note.

RZ10 -> Profile -> Change -> [Your Instance Profile] -> Extended maintenance -> Filter: icm/max_request_size_KB -> Change value (e.g., to 102400 for 100MB). Save and activate.

4

Restart ICM and Application Server. For the parameter changes to take effect, you will need to restart the ICM (Internet Communication Manager) and potentially the entire application server. This can be done through transaction SMICM or by restarting the SAP instance.

SMICM -> Administration -> ICM -> Exit Hard -> Global. Alternatively, restart the SAP instance using `stopsap` and `startsap`.

2. Optimize Data Generation for XML Output advanced

Reduce the size of the data being processed before it's converted to XML.

1

Analyze the source of the large XML data. Identify the specific ABAP program, function module, or report that is generating the large XML output. Use transaction ST05 (SQL Trace) or ST12 (Single Transaction Analysis) to pinpoint the bottleneck.

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2

Refactor ABAP code to reduce data volume. Review the code that retrieves and processes data for XML generation. Look for opportunities to:
- Select only necessary fields.
- Filter data more aggressively at the database level (e.g., using WHERE clauses).
- Avoid fetching large internal tables if only a subset is needed.
- Use more efficient data structures if applicable.

Example ABAP snippet (conceptual):
abap
* Instead of:
SELECT * FROM some_table INTO TABLE lt_data.

* Consider:
SELECT field1 field2 field3 FROM some_table INTO TABLE lt_data WHERE condition = 'X'.

3

Implement data chunking or pagination. If the data is inherently large, consider generating the XML in smaller chunks or implementing pagination. This might involve modifying the calling program or the XML generation logic to process data in batches.

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4

Review and optimize XML serialization logic. Ensure that the XML serialization process itself is efficient. Some libraries or methods might be more resource-intensive than others. If using standard SAP classes, ensure they are utilized correctly and efficiently.

3. Adjust ICM Parameters for Larger Buffer medium

Directly increase the ICM's request buffer size.

1

Access ICM Configuration. Use transaction SMICM to access the ICM configuration.

SMICM

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Navigate to Global Settings. Go to Goto -> Parameters -> Display/Change.

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3

Locate and Modify `icm/max_request_size_KB`. Search for the parameter `icm/max_request_size_KB`. If it doesn't exist, you might need to add it based on SAP Notes or system recommendations. Increase its value. A common starting point for larger payloads could be 102400 (100MB), but consult SAP Notes for optimal values.

Parameter Name: icm/max_request_size_KB
New Value: 102400 (or as per SAP Note recommendation)

4

Save and Activate Changes. After changing the parameter, save the new profile and activate it.

Click the 'Save' button in the parameter maintenance screen.

5

Restart ICM. For the changes to take effect, restart the ICM. Go to Administration -> ICM -> Exit Hard -> Global.

SMICM -> Administration -> ICM -> Exit Hard -> Global

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Related Errors

5 related errors

SAP S/4HANA Error 5176: XML Output Buffer Exceeded