In that case, the seller will make changes to the selling price. The seller will have to do a book with reasons to the buyer. Not less than 30 days, and must obtain consent or agreement from the purchaser.
If the vendor to make changes to selling prices. The seller must make a written description. With reasons to buy at least 30 days and must be allowed. Or agreement from the buyer
In case the seller will change the sale price. The seller must do a detailed book. And show the reasons to the buyer, no less than 30 days and without the consent or agreement from the buyer.