ABAP Proxy timeout ?

Dear All experts

I have succesfully implemented a call to a external webservice from ABAP (se80) by generating an ABAP proxy.

BUT :

How do I setup a "timeout" on the ABAP proxy if the external webservice somehow is not responding ?

eg. I would like the timeout to be 30 seconds.

As it is right now it just "hangs"...

best regards

Lars