workflow container variable

Hi,

I went to txn pftc and gave the varialbe for workflow container as suggested by Ramki maley ,but now i get the error,cannot assign

'BUS2105' is not an import element and therefore should not be changed

how can I set the import parameter for a variable.

I tried in transaction pftc,but it does not reflect in my binding fo the task specified.

If the value must be set, mark the element BUS2105 as an import parameter so that it can be included in the interface.

how to do this.

Regards,

Latha prabhu.