Property or special interest from seller to buyer. In order to establish a valid purchase contract, it is essential that the transfer of ownership takes place locally. But the ownership of the goods, that is, the ownership of the goods, passes immediately from the seller to the seller if there is a willingness on both sides to make a sale, that is, the buyer accepts the purchase and the seller is ready to sell the goods at monetary value. In the case of a sales contract, the execution of the contract takes place at a later date, i.e. when the time has elapsed or when the necessary conditions are met. Once the contract is executed, it becomes a valid sale. All the necessary conditions at the time of sale must also be present in the case of a sales contract. At the time of sale, the seller may not resell the goods; if he does so, he may be sued for damages.