When you have Two orders and you want it to be combined into one delivery certain characteristics need to be the same for the two orders. Mark the correct item
Shipping point, Delivery date, Ship to party, Route, Payment terms, Order combination indicator on customer master
Sales Organisation, Delivery date, Ship to party, Route, Payment terms, Order combination indicator on customer master
Sales Organisation, Delivery date, Ship to party, Route, Incoterms, Order combination indicator on customer master
Shipping point, Delivery date, Sold to party, Route, Incoterms, Order combination indicator on customer master
Shipping point, Delivery date, Ship to party, Route, Incoterms, Order combination indicator on customer master