XSJS Response FollowUp without functionName

Hi,

I have implemented a create XSJS service and a read XSJS service.

Now I want to use the read XSJS service as response of the create XSJS service.

Therefore I tried to use the following API method:

$.response.followUp({

    uri : 'package:read.xsjs',

    parameter : {

        ID : id

    }

});

Now I get the error message, that the parameter functionName of the $.response.followUp method is not of type String, as I did not provide it.

Is it possible to call the XSJS service without a functionName?

Regards,

Michael