delivery challan

can I generate delivery challan for supply of goods and provide e-way bill for its movement..??or tax invoice is mandatory to deliver the good to the party.....suppose my tax invoice value to the retailer is of 1lakh RS....including GST.....and I have given delivery challan in the vehicle....and if in case checking done on road...whether penalty will happen....??also I will provide them the tax invoice later once they receive the good....so..just want to ask...when to issue delivery challan?