When importing a WSDL, all fields marked as xsd:long result in INT4 in the proxy class. But long is [supposed to be|http://www.w3schools.com/schema/schema_dtypes_numeric.asp] 8-byte (64 bit). We thus get the following error:
SOAP:1.001 CX_SY_CONVERSION_OVERFLOW:XSLT exception. An error occurred when deserializing in the simple transformation program /1SAI/TXS291D096A2B8E35E8375E. Overflow converting from '2147483648'
<xsd:element minOccurs="0" name="Available" type="xsd:long"/>