RFC error lookup of alternativeServiceIdentifier via CPA-cache failed for c

Hi All,

When i execute RFC from R3 to call Webservice through XI, i am getting the following error "lookup of alternativeServiceIdentifier via CPA-cache failed for channel". I refreshed the CPA cache and compared Business System in ID with SLD. The RFC destinations are created as TCP/IP and logical destination with reference as TCP/IP. What else to check and do? Any suggestions would be appreciated.

Thanks

Deno