Workflow issues

Hi,

I have a workflow, wich has a task that to carry out a order of Aerial ticket for transaction ME21N, the task does not create the order when the aplication launch the workflow, I run the task for the transaction SWUS with the same values of the container and it works. How can I do it? the task has the status en NOT DEFINED, may be this a cause for the task does not work in the workflow?.

Thanks.