MappingDocumentBuilderFactory not found

Hi,

We recently upgraded our PO to 7.31 SP 8.

We have a number of scenarios where we use a SOAP Lookup function where the XML response is parsed into an XML format using DocumentBuilderFactory class.

Before the upgrade this worked fine. After the upgrade, it still works fine when testing the mapping in the ESR. However at runtime I get a mapping exception :

Exception:[javax.xml.parsers.FactoryConfigurationError: Provider com.sap.aii.ib.server.mapping.execution.jaxpfactories.MappingDocumentBuilderFactory not found]

Does anyone have a clue what the reason could be ?

Thanks,

Jan