How to add ATWRT (AUSP table ) field to 2LIS_03_BF Data Source.

Hello Experts,

I got requirement as where  i want to add field into 2lis_03_bf  which is there in AUSP of ATWRT.

Here, i can enhance my Data Souce to add ATWRT field but i am not find any relation with AUSP Table because OBJK,ATINN,ATZHL etc are Key fields.

Could any one please tell me how can i add ATWRT field to this Data Source.

Waiting for Inputs.

Regards

Reddy.