Vehicle number is required. VRL must have transporter ID. You need to force them to provide vehicle number or transporter id.
I understand it looks bit impractical to raise an E-way bill but there is no other way.
One of client who bought materials from Gujarat, was caught in Karnataka without E-way Bill. We had to create E-way bill to move vehicle.
You have to ask VRL to provide transporter id or vehicle number.
chatCommentsI have observed that if we enter outside Karnataka GSTIN of the transporter, the error shows as Unregisterred Transporter. I hope the department will rectify this. Each transporter has different GSTIN for each state. I think you will not get error for VRL Karnataka GSTIN for the timebeing. - Basheer PM