Hi Tomasz,
I cannot establish RFC: SAP_PROXY_ESR because of some problem at this moment, so using ABAP Proxy is not possible ("No connection to ESR. Only local dataaredisplayed.")
Can you check in SM59 Type H if there is another RFC destination that is pointing to your integration server? Only one needs to be maintained.
My question is: is it possible, still, to configure scenario WebService(SAP) - PI (7.4) - WebService(non-SAP) (two-ways communication). I mean, do I need ABAP Proxy to consume/provide services. Or I can implement before mentioned scenario successfully (it could be problem to call service in abap side?) ?
You can always use CL_HTTP_CLIENT to POST a message to XI. It will not require an abap proxy connection. If the connection is local, the latest metadata that will be used is before the connection got interrupted. Which would mean any other additional changes to the message type will not reflect in the Abap Proxy, but it can still be used/triggered using the old metadata.
Regards,
Mark