Calling WD application in SAPGUI of other R/3 (non-WDA) system

Hi,

We have WD application in CRM system. We want to call this application in R/3 system (which is not upgraded to WDA). We don't want to call in web-browser bcoz we are calling GUI transaction from the WD application.

I tried this by creating a RFM in CRM, which calls FM 'WDY_EXECUTE_IN_PLACE'. And then calling new RFM from R/3. I am getting "control error".

Any ideas?

Thank you.