Is LSMW allowed in CRM?

Hi Everyone,

We need to migrate mass data (service orders) from AS400 to our SAP CRM system. I was wondering what kind of tool I can use. Is LSMW an option? If yes, I believe Batch Data Input would not work, am I correct. And if LSMW is not an option, can you suggest any tool/programs I can use?

Thanks a lot in advance.