Error

Error Code: 593

SAP S/4HANA Error 593: API Requires Remote Access

📦 SAP S/4HANA

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Description

Error 593, ERR_API_REMOTE_ONLY, signifies that an attempt was made to execute an SAP S/4HANA API function locally that is explicitly designed for remote access only. This typically occurs when a program or integration tries to call a remote-only service or API directly from within the SAP S/4HANA system, rather than through its designated remote invocation mechanism.

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Error Message

ERR_API_REMOTE_ONLY

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Known Causes

4 known causes

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Incorrect API Call Pattern

A custom application or development object attempts to invoke an API that is configured for remote access only, using a local call mechanism.

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Integration Configuration Error

An external system or integration platform is misconfigured, leading it to access a remote-only API locally, bypassing the required remote communication protocols.

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API Definition Mismatch

The API's configuration or metadata incorrectly designates it as remote-only, or the calling program uses an outdated definition that forces a local call.

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Security Policy Violation

The system's security policies or the API's design restricts its invocation to remote, authenticated channels only, preventing local direct access.

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Solutions

3 solutions available

1. Enable Remote Function Call (RFC) Destination for the Calling System medium

Configure the RFC destination in the S/4HANA system to allow the calling system to execute remote functions.

Log in to your SAP S/4HANA system with a user having the necessary authorization (e.g., SAP_ALL profile or specific RFC authorization).

Navigate to transaction code SM59 (RFC Destinations).

Create a new RFC destination or modify an existing one. Ensure the destination type is 'G' (HTTP Connection to ABAP System) or '3' (SAP System).

Example: Create a new RFC Destination for a calling ABAP system.

For type '3' destinations, configure the 'Technical Settings' tab with the correct Program ID and Gateway host/service. The Program ID is crucial for inbound RFC calls.

Program ID: <Your_Program_ID>
Gateway Host: <Hostname_of_Gateway>
Gateway Service: <Gateway_Service_Port>

For type 'G' destinations, configure the 'Technical Settings' tab with the correct Target Host, Service No., and Path Prefix. Ensure the connection test is successful.

Target Host: <Hostname_of_Target_System>
Service No.: <Port_Number>
Path Prefix: /sap/bc/idoc_listener/<Your_IDoc_Interface>

In the 'Logon & Security' tab, configure the appropriate client, language, username, and password (or SSO settings) for the RFC connection.

Client: <S/4HANA_Client>
Language: EN
Username: <RFC_User>
Password: <RFC_User_Password>

Save the RFC destination. Test the connection using the 'Connection Test' and 'Unicode Test' buttons. Address any errors encountered during testing.

Ensure the calling system is configured to use this RFC destination when invoking the S/4HANA API.

2. Verify and Correct API Invocation Logic in the Calling System medium

Review and adjust the code in the system initiating the API call to ensure it's correctly targeting an RFC-enabled interface.

Identify the specific API call that is failing with error 593. This usually involves looking at the logs of the calling application or middleware.

Examine the code responsible for making the API call. This could be ABAP code, a Java application, or a middleware configuration.

Example (ABAP): Inspect the CALL FUNCTION statement or RFC client code.

Ensure the API being called is designed to be invoked remotely via RFC or HTTP/SOAP. Some APIs might be local-only.

Check SAP documentation or the API's definition for remote enablement.

Verify that the RFC destination name or endpoint URL used in the calling code correctly matches the configured destination in S/4HANA (as per Solution 1).

Example (ABAP): `CALL FUNCTION 'REMOTE_FUNCTION_MODULE' DESTINATION RFC_DESTINATION_NAME ...`

If the API expects specific data structures or parameters, ensure they are being passed correctly and in the expected format.

If using OData services, ensure the service is activated and accessible via the correct URL and HTTP method.

Example OData URL: `/sap/opu/odata/sap/<SERVICE_NAME>/<ENTITY_SET>`

If the error persists, consider temporarily simplifying the API call to isolate the issue. Make a call with minimal parameters to see if it succeeds.

3. Enable Inbound HTTP/SOAP Services for API Access advanced

Configure the S/4HANA system to expose the required API functionality via HTTP or SOAP endpoints if the calling system prefers these protocols.

Identify the specific API functionality that needs to be accessed remotely. This might be an OData service, a SOAP service, or a custom HTTP handler.

For OData services, use transaction SICF to ensure the relevant service nodes are active. Navigate to `/default_host/sap/opu/odata/sap/`. Activate the service node if it's inactive.

Transaction: SICF
Path: /default_host/sap/opu/odata/sap/<SERVICE_NAME>

For SOAP services, use transaction SOAMANAGER to discover, configure, and publish the required web services. Ensure the service provider is correctly set up.

Transaction: SOAMANAGER
Navigate to: Service Administration -> Provider Proxy
Search for your service.

If it's a custom HTTP handler, ensure it's correctly implemented in ABAP and registered for inbound HTTP requests. This often involves using the `IF_HTTP_EXTENSION` interface.

Example ABAP (conceptual):
abap
CLASS zcl_my_http_handler DEFINITION INHERITING FROM cl_http_extension.
  PUBLIC SECTION.
    METHODS handle_request REDEFINITION.
ENDCLASS.

CLASS zcl_my_http_handler IMPLEMENTATION.
  METHOD handle_request.
    " Process incoming request
    response->set_c_header_field( name = 'Content-Type' value = 'application/json' ).
    response->set_data( '{"message": "Hello from S/4HANA!"}' ).
  ENDMETHOD.
ENDCLASS.

" Registration in SICF or other HTTP framework is required.

Configure the SAP Web Dispatcher (if used) to route external requests to the appropriate S/4HANA instance and service.

Example Web Dispatcher profile configuration:
`icm/server_port_<n> = PROT=HTTP,PORT=8000,TIMEOUT=60,PROCTIMEOUT=60
`
`wdisp/system_<m> = SID=<S/4HANA_SID>, MHOST=<S/4HANA_HOST>, MPORT=<S/4HANA_PORT>`

Ensure appropriate network firewalls and security groups allow inbound traffic to the S/4HANA system on the configured HTTP/SOAP ports.

Test the API endpoint from the calling system using tools like Postman or by executing the API call within the calling application.

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