How To Fix /IWPGW/PGW_SERVICE004 - Filter parameter '&1' does not support more than one filter value

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWPGW/PGW_SERVICE -

• Message number: 004

• Message text: Filter parameter '&1' does not support more than one filter value

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWPGW/PGW_SERVICE004 - Filter parameter '&1' does not support more than one filter value ?

  The SAP error message /IWPGW/PGW_SERVICE004 Filter parameter '&1' does not support more than one filter value typically occurs in the context of SAP Gateway services when a filter parameter is being used incorrectly. This error indicates that a specific filter parameter (represented by &1 in the message) is expected to accept only a single value, but multiple values have been provided.
  Cause:
  
  Multiple Values Provided: The most common cause of this error is that the client (e.g., an application or a user) is trying to pass multiple values for a filter parameter that is designed to accept only one value.
  Incorrect URL Format: If the filter is being applied in a URL, it may be incorrectly formatted, leading to the system interpreting it as multiple values.
  Service Definition: The service definition in the SAP Gateway may have been set up to only allow a single value for that particular filter parameter.
  
  Solution:
  
  Check the Filter Parameter: Review the API documentation or service definition to confirm that the filter parameter in question is indeed designed to accept only a single value.
  Modify the Request: If you are sending a request (e.g., an OData query), ensure that you are only providing a single value for the filter parameter. For example, if the filter is supposed to be ?$filter=Status eq 'Active', ensure you are not trying to use something like ?$filter=Status eq 'Active' or Status eq 'Inactive'.
  Adjust the Client Code: If you are developing a client application, modify the code to ensure that it constructs the request correctly, adhering to the single-value requirement for the filter parameter.
  Debugging: If you are unsure where the multiple values are coming from, consider logging the request being sent to the SAP Gateway to identify how the filter parameter is being constructed.
  
  Related Information:
  
  SAP Gateway Services: Understanding how SAP Gateway services work, including OData services, can help in troubleshooting such issues.
  OData Protocol: Familiarity with the OData protocol and its filtering capabilities can provide insights into how to structure requests correctly.
  SAP Notes and Documentation: Check SAP Notes or the official SAP documentation for any known issues or updates related to the specific service you are using.
  
  If the problem persists after following these steps, consider reaching out to your SAP support team or consulting the SAP Community for further assistance.