EWay Bill in continuous Supply of Goods

one of my client business in supply of goods of construction materials like greet kapchi metal in continuous supply of goods basics,
he issued delivery challan at supply of material to party, and invoice raise on last date of the month, total invoice value is more than 50000 but at the time of supply of goods on delivery challan basis material challan value is less than 50000,
in this case party has required to furnish eway bill on delivery challan in gst or not