Urgent : Connection problem

Hi experts,

I developped a portal application which calls a BW function module. My problem is the following:

Into the development environment all works fine, data are retrived ...

Into the test environment, the application interface is displayed but no data is available. Function module seems to don't be called.

An other point to note : Data can be available in my application with the following steps.

- A portal user execute another IView (no relation with my application) which needs a connection to BW. A connection popup is displayed and the user types his login/password.

- After this step, when the user access to my portal application, data are retrieved.

This process seems to be in relation with the connection cookie.

In addition, the test of the connexion to BW from portal is OK (System administration / System configuration).

I think that my Java development works fine.

My impression is that some elements into the test portal have not been well configurated (Permissions, some parameters for the connection ...).

Someone can help me ?

Thanks in advance.