1.First, execute transaction code SE18 and then enter the BADI ‘BADI_SD_SALES_ITEM’ and select ‘Display’ button
2.Now please click on ‘Implementation’ and then select overview as shown in screenshot below
3.Now create button and give implementation name as ‘R_1PCL_GST_PARTNER' and then select ‘continue’ button
4.Now give sort text as ‘Determine GST’
5.Now please save and activate in package ‘J1I_GST_LO’
6.At last please select enhancement implementation created and then click on continue button i.e R_1PCL_GST_PARTNER.