Calling ABAP Webservice from BPM

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Dear all,

I've performed the following steps in order to call a ABAP web service in an ECC system:

1: generate WS from function module

http://avelon03.avelon.local:8003/sap/bc/srt/rfc/sap/Z_maandag?sap-client=800&wsdl=1.1

2: create provider system for the backend system (destination ping = OK)

3: publish WS to Service Registry using the backend system as physical system

4: test the published service in the WSnavigator. I get prompted to log on to the backend system (as expected) and the service works. There a no obligatory parameters.

5: consume WS in BPM process. Select from the SR. The service definition is shown, but I cannot select a endpoint reference (lower part of the screen)!?

6: create automated activity and assign service to the created Service Group

7: Assign Service Group to Provider system in Business scenario communication

When I test this scenario I get a "unauthorised" error which indicates a error on the endpoint. I also believe the problem is caused by the endpoint. On another system I had this scenario running, but for some reason after a re-installation (trial version expired), it doesn't works anymore.

I have found several posts on this issue, but haven't found the solution...

Hopefully somebody can point me in the right direction. Please let me know if I can send the screenshots for more details.

Thanks a lot