SAP4Rails: "missing_method" error during execution of model
I was trying to develop an example described in Piers Harding's <a href="/people/piers.harding/blog/2005/08/03/sap-on-rails-and-not-on-the-skids but I've got some problems with runing the application. When the list action is triggered an error with message "missing_method: BAPI_EXCHRATE_GETSURRENTRATES" occurs, and I have now idea what is wrong?
I work with Windows XP and I've installed saprfc(0.34), sapnwrfc(0.06), sap4rails(0.15) and sapwas(0.12) libraries.
I would be grateful for any help.