The Supreme Court held that although the law does not stipulate that before reducing the price the seller has to be given an additional reasonable term for performing the obligation, such an obligation might arise from the principle of good faith, especially if the contrary would cause disproportionate costs to the seller.
The declaration for price reduction does not have any formal requirements and it can be done also during court proceedings. The law does not set a term for making a price reduction. The reduction of price can, however, be impermissible due to non-compliance with the principle of good faith if the seller has been given a justified expectation that the price will not be reduced, because such a right has not been used for a long time.
The reduction of price can be void if the period of limitation for the claim of performance has passed. In that case, if the buyer bases its claim on the non-compliance of the performance, the reduction of price based on the lack of compliance, is void.