Tax Breakup Column Header edit


I am using the ERPNEXT 13. When invoicing I will add the shipping charges in the Other charges and taxes column. But the tax is also calculated on the shipping charge.

But in the tax breakup it shows as Taxable amount (for the value in the itemized list)
Attached the snapshot with highlighted.

Any solution for this.
If the header is changeable is fine.

If I add the shipping charges in the itemized list. then it shows as 1 no in the delivery note. When using picklist it shows insufficient quantity etc.

Kindly help on this.!