Variation listing coming up with same Asin

Hi all! I am sending my inventory for the first time to Fba so totally newbie. Need your help! One of my listing has variations of colours . When I try to create the shipment, Amazon Fba uses the Same ASIN for all colours and don’t let me create the shipment saying it’s a same Asin in in real
They all different colours. What is the best way of getting through this?