Why only create instance on receive activites?

Hi,
I have a couple of integrations where I have to poll a Web Service continually. To get the flow going I have to read a dummy file and in a loop call the Web Service. I don’t understand why there is this restriction. Why can’t all activities create an instance? I also have an integration where I continually call a PL/SQL procedure and process the output. Also here I have to first have a receive process that reads a dummy file before the real integrations can start. There must be a good reason for this I just can’t think of one. :-)
Regards Pete

Thanks HEWizard,
I can access tables and PL/SQL from BPEL, but I need a dummy receive activity first like reading a dummy file or polling a dummy table and updating/deleting a row in the table. I don’t understand why that is.
If I create a Partner Link that calls a PL/SQL procedure and use a receive activity to call it, I get the error “Operation is not specified” (http://theheat.dk/bpelDb1.jpg)
If I use an invoke activity to call it I get an error because I don’t have a receive activity first (http://theheat.dk/bpelDb2.jpg)
Regards Pete

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