Gstr1 offline utility - b2b - one invoice with multiple tax

HI, Please let me know how to show single invoice with different tax rates in gstr1 b2b offline utility. I have one invoice with tax rate of 5% & 18%. I am entering same invoice twice with different tax rates and its taxable value (keeping the invoice value same in both rows). Now, when I import the same in offline utility software it only shows entry with higher tax rate i.e. 18% and ignores the other half of the same invoice with 5% rate. Please help.