A program product and system are disclosed for receiving a transport message from an external service component by way of an external transport protocol. The transport message includes both primary data and context data. Once received, the primary data and context data are extracted from the transport message and translated into a format required by an SCA message. The primary data is then inserted into a body of the SCA message and the context data is implicitly inserted into a transmit header of the SCA message. The transmit header of the SCA message uses a universal format for carrying context data received over various different external transport protocols.