BAPI_MATERIAL_SAVEDATA and roll back

Dear all

im creating basic data by using bapi_material_Savedata in the simulation mode , once i have created basic data i done the roll back..now im trying to create plant data for the material by calling bapi again here im doing view wise upload ,,now system thro's error material does not exist. because i have done the roll back...my requirement is i have to roll back the basic data after simulating all the views for the material ,,how to acheive this...

Thanks