Description:
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The WSDL I'm using has a <complexType name="directDebitPaymentInput"> element with a <group ref="ddp:directDebitPaymentInputGroup"> include.

SoapClient understands that this means the resulting directDebitPaymentInput field should include the fields from the group, as well as the direct child element 'mandateNumber'. You can see this in the sample code.

However when I make the actual request, the 'mandateNumber' field is not included in the request XML.

Test script:
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https://gist.github.com/tinmrn/7978a170acb65a9f597cbc69e3ae3153

Expected result:
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I expect the directDebitPaymentInput element to contain the mandateNumber element, as supplied in the input.

Actual result:
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7.4.14
struct directDebitPaymentInput {
 string35 holderName;
 bic bic;
 iban iban;
 string35 mandateNumber;
}
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://www.docdatapayments.com/services/paymentservice/1_3/"><SOAP-ENV:Body><ns1:startRequest><ns1:merchant name="bogus" password="bogus"/><ns1:paymentOrderKey>bogus</ns1:paymentOrderKey><ns1:payment><ns1:paymentMethod>bogus</ns1:paymentMethod><ns1:directDebitPaymentInput><ns1:bic>test-bic</ns1:bic><ns1:iban>test-iban</ns1:iban></ns1:directDebitPaymentInput></ns1:payment></ns1:startRequest></SOAP-ENV:Body></SOAP-ENV:Envelope>