How to call a process from another project

Hi;
How to calling a process from another process in another project? Which activity that i need or web service, direct binding? I use 11g

Hi Tulasi ;
I have wsdl of the process i need to call. Also wsdl address on the server. But CALL activity can't use to service call. CALL activity can use only to reusable process call.
I think, this operation must make on composite.xml. But I have a same problem with this method and it don't work.
I create a base process that looking at below. It's include a direct binding. Is it include a direct binding?
[Base Process|http://d1201.hizliresim.com/t/s/21wqu.png]
Then i create a process that call to base process:
[Caller Process|http://d1201.hizliresim.com/t/s/21wqx.png]
I paste to base process' wsdl address on the server. Then i select port type (BaseProcessPortType) and a warning has occured that you see the picture above. Base Process contain Oracle SOA Composite Type. What's the wrong? It happened for Callback Port Type.
And second question is what's the Address? (under Reference Binding Setails option).
I think, i create the this direct binding correctly, i call to base process into my caller process via service activities.

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