Master data deletion

Hello,

Few materials are being deleted in the source system.

In BW we have a full load for the Material master data, So the deleted materials still appear in BW.

As far as I know, Its adviced not to delete the master data content.

Can you help me in achieving this in a different method.

The requirement is : We dont need those materials anymore in BW. How to get rid of them

regards,

MMm