Archive Info Structure SAP_SRB_MATBEL1 - adding fields

Hello,

I have a question regarding MM archiving info structure SAP_DRB_MATBE1. We have activated this and have been using it for a while now. We want to add the batch field to the field catalogue. How can this done? Adding the field to the info structure isn't a problem. However the SAP table ZARIXZMM4 associated with the info structure is active with millions of records in it. Is there any way to add the batch field to the info structure and then regenerate this table with the batch number included?

thanks, Bryan.