How to read file on demand (or) avoid polling in bpel 11g?

Hello -
Scenario - Receive two files(A & B) which should end up in two tables (Header, Lines)
BPEL process -
1) Receive acitivity - To Read file (A) via File adapter
2) Tranformed
3) Invoked the Db adapter to insert into "Header" table
4) Added another Receive activity - To Read file (B) via File adapter
5) Transformed
6) Invoked the Db adapter to insert into "Line" table
Issue - Step 4 gets fired as a SEPARATE instance (but no data in lines table) . At the end - I see the BPEL process which is waiting for File B. Even after I dropped File B - I dont see any records going into tables.
Is there a better way to design this process? Do I need to separate BPEL process to insert into Header & Line table? If so - how can I make this sequential process?
Appreciate detailed steps, if possible
Thanks
Babu

If its really a SyncRead Step 4 willl not run as a seperate process.
Step1: Initiates the process once the header file arrived
Step4: Will be invoked like a normal partnerlink.
Just make sure, you put the lines file before the header file in the directory.
If it doesnot resolve the problem, send your project to me helloprasanna at rediffmail.com . I'll have a look.
--Prasanna

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