How to change read-directory when using file adapter

Hi, I'm deploying BPEL process to read files from a directory. I want to change the directory where to read dynamically. This can be achieved by using a file header variable. I know how to do this. But, the problem for me is that I can not find a place to assign this file header variable a correct value. The first step in my BPEL process is the receive-step and this has to be the first step. I wanted to place the assign-step before this step but this makes the BPEL process invalid. First step has to be a receive or a pick-step. So, now I have a dilemma! Anyone an advice on this?
Thanks in advance.

Maybe you can use this information :
http://otndnld.oracle.co.jp/document/products/as10g/1012/doc_v3/integrate.1012/B14448-01/html/app_trblshoot.htm
A.3.3 Common User Errors explains something about the fileheader messages

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Hi Anirudh,
Please have a look at the answers for ur questions:
(1)Is it a .pdf file?
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How to change read-directory when using file adapter

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