Change workflow is not getting triggered

Hi ,

We have a created a change workflow which is to be triggered when a IS-MAM order(Media Order) is to be changed . This has to be triggered only when a specific field in the order has to be changed . For this we have set a condition in transaction SWEC and the necessary steps are followed , still the workflow is not getting triggered . Could anybody tell me if there are any other pre-requisites that i am missing ?

Thanks

Mayank