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Description

This error indicates that an API call to SAP S/4HANA is missing one or more essential parameters. It typically occurs when an external system or an internal application attempts to interact with an S/4HANA API without providing all the necessary data fields, preventing the intended operation from completing successfully.

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Error Message

ERR_API_MISSING_PARAMETER

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Known Causes

4 known causes

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Incorrect API Call Syntax

The structure of the API request payload or URL parameters does not match the expected format, leading to the omission of required fields.

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Incomplete Data Input

A user or an integrated system failed to provide all necessary data fields when initiating a transaction or process through an S/4HANA interface.

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API Contract Mismatch

The calling application is using an outdated API definition or an incorrect version of the API, where expected parameters have changed.

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Missing Configuration

Essential configuration settings within SAP S/4HANA or the integrated system are not maintained, preventing the automatic generation or retrieval of required parameters.

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Solutions

4 solutions available

1. Verify API Call Parameters in ABAP Program medium

Correctly populate all mandatory parameters when calling S/4HANA APIs from ABAP.

1

Identify the ABAP program or transaction that is triggering the API call. This often involves debugging the relevant code to pinpoint the exact API being invoked.

2

Review the API documentation for the specific S/4HANA API being used. Pay close attention to the 'Required Parameters' section.

3

Examine the ABAP code where the API is called. Ensure that all parameters marked as mandatory in the API documentation are being passed with valid data. Common mistakes include passing initial values for required fields or omitting them entirely.

Example ABAP code snippet:

DATA: ls_api_parameters TYPE your_api_structure.

" Ensure all required fields in ls_api_parameters are populated
ls_api_parameters-mandatory_field_1 = 'SomeValue'.
ls_api_parameters-mandatory_field_2 = 123.

CALL FUNCTION 'YOUR_API_FUNCTION_MODULE'
  EXPORTING
    i_parameter_1 = ls_api_parameters-mandatory_field_1
    i_parameter_2 = ls_api_parameters-mandatory_field_2
  IMPORTING
    e_return_code = lv_return_code.

IF lv_return_code <> 0.
  " Handle error
ENDIF.

4

If the API is called via a BAPI (Business Application Programming Interface), ensure that all corresponding import parameters in the ABAP code are correctly populated.

2. Check Data Model and Data Types for API Input medium

Ensure that the data types and structure of the provided parameters match the API's expectations.

1

Consult the S/4HANA API documentation or the relevant data dictionary (SE11) for the data structures and data types expected by the API.

2

Verify that the ABAP variables or structures used to pass data to the API have compatible data types. Mismatches (e.g., passing a character string to a numeric field) can lead to this error.

Example ABAP data type check:

" In SE11, check the data element for the API parameter.
" For example, if the API expects a NUMC field of length 10:
DATA: lv_numeric_value TYPE p DECIMALS 2.

" Ensure the value assigned to lv_numeric_value is correctly formatted
" and compatible with the API's expected type (e.g., NUMC(10)).

3

If the API expects a specific internal table or structure, ensure that it is populated with the correct number of rows and that each field within the structure/table adheres to the defined data types and lengths.

3. Review OData Service Configuration and Metadata advanced

Validate the OData service definition and ensure it accurately reflects the expected parameters.

1

If the API is exposed as an OData service, use transaction `SEGW` (Gateway Service Builder) to inspect the service definition.

2

Navigate to the relevant Entity Type and its associated Operations (e.g., Create, Update, Read). Examine the import and export parameters defined for these operations.

3

Compare the parameters defined in the OData service metadata with the parameters being sent by the client application (e.g., a Fiori app, external system). Ensure that all required parameters are present and correctly named.

Use tools like Fiddler or browser developer tools to inspect the HTTP requests being sent to the OData service and compare them against the service metadata.

4

If the service was recently modified, ensure that the service has been regenerated and activated correctly within `SEGW` and that the corresponding ICF node is active.

4. Investigate Custom Enhancements and Extensions advanced

Examine custom code that might be modifying or intercepting API calls.

1

If the API call passes through any custom enhancement points (user exits, BAdIs, implicit enhancements), investigate the logic within these enhancements. They might be inadvertently removing or altering required parameters.

2

Use debugging tools to step through the code at these enhancement points and observe the state of the API parameters before and after the enhancement logic is executed.

3

If custom logic is found to be problematic, either correct the enhancement to preserve the required parameters or temporarily deactivate it for testing purposes.

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Related Errors

5 related errors

SAP S/4HANA Error 590: API Missing Required Parameters