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Description

Error 581, 'ERR_API_ONLY_SINGLE_STATEMENT', indicates that an API function designed to process only a single operation or statement has received a request containing multiple statements. This typically occurs when an application attempts to send a batch of operations or a multi-statement transaction to an endpoint that expects an atomic, singular action.

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Error Message

ERR_API_ONLY_SINGLE_STATEMENT: This function can be called only in the case of single statement

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Known Causes

3 known causes

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Multiple Statements in API Request

The API function was invoked with a request payload or parameters containing more than one operation or statement, violating the function's single-statement constraint. 💻

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Incorrect API Function Usage

The calling system or application attempted to use a function designed for a single, atomic operation in a context requiring multiple operations, misunderstanding its intended scope. ⚙

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Batch Processing on Single Endpoint

An attempt was made to send a batch of operations or a multi-statement transaction to an API endpoint specifically designed to process only one statement at a time. 💻

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Solutions

3 solutions available

1. Review and Refactor Batch Operations medium

Identify and modify code that attempts to execute multiple SQL statements within a single API call.

1

Analyze the application code or custom reports that are triggering error 581. Look for areas where multiple DML (INSERT, UPDATE, DELETE) or DDL (CREATE, ALTER, DROP) statements are being executed consecutively without an intervening commit or separation.

2

For each identified batch operation, refactor the code to ensure that each SQL statement is executed as a distinct operation. This typically involves committing or rolling back transactions between statements if they are logically independent. If they are part of a single logical unit of work, consider using a single, more complex statement (e.g., a MERGE statement or a stored procedure that handles the logic internally).

Example of refactoring multiple statements into a single MERGE (conceptually):

-- Original (potentially causing error):
UPDATE target_table SET column1 = 'value1' WHERE id = 1;
INSERT INTO target_table (id, column1) VALUES (1, 'value1');

-- Refactored using MERGE:
MERGE INTO target_table AS T
USING (VALUES (1, 'value1')) AS S (id, column1)
ON T.id = S.id
WHEN MATCHED THEN
  UPDATE SET T.column1 = S.column1
WHEN NOT MATCHED THEN
  INSERT (id, column1) VALUES (S.id, S.column1);

3

If the batch operation is necessary and cannot be simplified into a single statement, consider using a stored procedure or a database function that encapsulates the entire logic. This allows the calling application to execute a single 'CALL' statement, which the database then processes as a single unit.

CREATE OR REPLACE PROCEDURE process_batch_data (
  p_id IN NUMBER,
  p_value IN VARCHAR2
)
AS
BEGIN
  UPDATE target_table SET column1 = p_value WHERE id = p_id;
  IF SQL%ROWCOUNT = 0 THEN
    INSERT INTO target_table (id, column1) VALUES (p_id, p_value);
  END IF;
END;
/ 

-- In calling application:
CALL process_batch_data(1, 'new_value');

2. Examine SAP S/4HANA Application Logic medium

Investigate SAP standard or custom ABAP code for incorrect API usage.

1

If the error occurs within SAP S/4HANA applications (standard or custom), the issue likely lies in how ABAP programs are interacting with the database. Use ABAP debugging tools (e.g., SE80, ABAP Debugger) to step through the code that performs database operations.

2

Specifically, look for usage of ABAP SQL statements that might be implicitly or explicitly executing multiple statements when only one is expected by the underlying API or framework. This is particularly relevant for internal tables being processed in loops where each iteration might try to commit or perform a separate database operation.

Example of problematic ABAP code (conceptual):

LOOP AT it_data INTO wa_data.
  UPDATE ztable SET field1 = wa_data-field1 WHERE key = wa_data-key.
  IF sy-subrc = 0.
    COMMIT WORK.
  ENDIF.
ENDLOOP.

-- This can lead to multiple COMMIT WORK statements within a loop, which might be interpreted as multiple statements by certain APIs or frameworks.

3

Refactor the ABAP code to use single SQL statements where possible (e.g., `UPDATE ... FROM TABLE`) or to manage commits correctly outside of loops. Ensure that database changes are committed or rolled back in logical units of work.

Example of improved ABAP code:

UPDATE ztable FROM TABLE it_data.
IF sy-subrc = 0.
  COMMIT WORK.
ENDIF.

3. Verify API Implementation and Usage advanced

Ensure that the API being called is designed for single statements and is being used as intended.

1

Understand the specific API that is throwing error 581. This error message implies that a particular function or method is designed to process only one SQL statement at a time. Consult the API documentation for details on its expected input and behavior.

2

If you are developing or consuming a custom API, review its implementation. The API might be written in a way that it expects a single SQL statement string as input and executes it directly. If it's receiving multiple statements (e.g., concatenated strings or a list of statements), it will fail.

sql

3

When calling such APIs, ensure that you pass only a single, well-formed SQL statement. If you need to execute multiple operations, call the API multiple times, or encapsulate the logic within a stored procedure that the API can then call.

Correct usage of the above API:

SELECT execute_single_sql('SELECT COUNT(*) FROM table1') FROM dual; -- Correct usage

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Related Errors

5 related errors

SAP S/4HANA Error 581: API Single Statement Constraint