MRP VIEW

Hi All,

i have prgrm which downloads data from excel sheet and updates the material master using BAPI Fm

BAPI_MATERIAL_SAVEDATA.

I am able to create MRP view fot tnew materials. But i need to create MRP view for those existing maerials which do no have that view. How do I do i. Am not able to update using this bapi, is there any other way