Transferring parameters from workflow to BSP

Hi,

We have created a workflowtask which calls a BSP. The task is generated by wf_extsrv (webservices), we have defined several parameters. When testing the workflow the BSP application is started but the paramaters are not transferred from the task to the BSP. It seems we have to do something more in our BSP application. Where do we have to define the importparameters?

Many thanks,

Leo Jabaaij