Seller's Unilateral Modification of Fixed Delivery Date Constitutes Material Breach

A party contracted for the sale of goods with a fixed delivery date but later unilaterally modified the delivery schedule, leading the buyer to refuse acceptance and sue for contract resolution and damages, arguing the seller breached the essential terms of the agreement. The court upheld the lower court's decision to resolve the contract in favor of the buyer and award damages, reasoning that the fixed delivery date was a crucial condition of the contract, and the seller's unilateral modification constituted a material breach justifying the buyer's refusal to perform and subsequent claim for compensation.