Hi,
what kind of an PCo agent (socket, OPD DA,..) are you trying to use? And to which kind of destination do you want to connect? Mentioned SCN document describes connecting EWM MFS functionality with PCo socket agents. Report RPCO_BS_INT_TEST is not designed for socket agents but primarily for OPC-DA agents. For socket agents you better use the Z report Z_PCO_AGENT_COMMANDS instead. This report is part of the SCN document that describes handling of PCo custom agents.
In most cases the connection from SAP EWM/ERP systems to PCo agent fails. Therefore please check the corresponding RFC destination of your business suite system via transaction SM59 as it is described in the above mentioned document.
Greetings
Uwe