Using SAP Web Service from SAP by PHP with parameters

When working with SAP Web Services from PHP, you may encounter parameter-related issues that prevent successful data transmission. One of the most common problems is case sensitivity in parameter names.

Understanding SAP Case Sensitivity

SAP systems are case sensitive when it comes to web service parameters. This means that parameter names must exactly match the case specified in the WSDL (Web Services Description Language) definition. A common mistake is using incorrect casing for parameter names, which results in failed requests.

Common Case Sensitivity Issue

Consider the following incorrect parameter usage ?

// Incorrect - using all uppercase
$params = array(
    'HEADDATA' => array(
        'Material' => '12345',
        'Description' => 'Test Material'
    )
);

The correct approach is to use proper case as defined in the WSDL ?

// Correct - using proper case
$params = array(
    'HeadData' => array(
        'Material' => '12345',
        'Description' => 'Test Material'
    )
);

Checking WSDL for Parameter Names

To identify the correct parameter names and their case sensitivity, examine the WSDL definition. Look for structures like "StandardMaterialSaveData" where all members are defined with specific casing. SOAP protocol enforces this case sensitivity strictly.

Example WSDL Structure

A typical WSDL structure might look like this ?

<complexType name="StandardMaterialSaveData">
    <sequence>
        <element name="HeadData" type="MaterialHeadData" minOccurs="0"/>
        <element name="ClientData" type="MaterialClientData" minOccurs="0"/>
    </sequence>
</complexType>

Notice that the element name is HeadData, not HEADDATA. This exact casing must be used in your PHP code.

Conclusion

When integrating SAP web services with PHP, always verify parameter names against the WSDL definition to ensure proper case sensitivity. Using incorrect casing like HEADDATA instead of HeadData will cause the web service call to fail due to SAP's strict case sensitivity requirements.