SAPRFC Calling BC Flow Service

I’m getting below error message when i’m trying to access a SAP BC custom service from SAP-RFC through a inbound map!!!

Message: type:com.wm.app.b2b.server.AccessException user:null port:5544’ from:10.249.48.5 msg:[B2BSERV.0084.9004] Access Denied, Service: , Time: Thu, 27 May 2004 11:10:06 GMT

Any ideas why this is happening ?

Thanks
Sreedhar K