To meet E way bill and E invoice requirements, make sure the item master contains a valid HSN code, the unit is specified with UQC code, and the appropriate tax category is assigned.
Further ,To modify the Item master, follow these steps:
Step 1: Go to Administration then click on Master tab
Step 2: Then click on Item master tab and select the modify option
Step 3: Now, select the relevant item master and update the mandatory fields such as HSN code, unit, and tax category.
Step 4: After save the master , your item is ready for E way and e invoice generation.