Article 466-4Seizure of Claim Subject to Manifestation of Intention to Restrict Assignment
第四百六十六条の四（譲渡制限の意思表示がされた債権の差押え）
The provisions of Article 466, paragraph (3) do not apply to an attaching obligee that has conducted enforcement against a claim that is subject to the manifestation of intention to restrict assignment.
第四百六十六条第三項の規定は、譲渡制限の意思表示がされた債権に対する強制執行をした差押債権者に対しては、適用しない。
Notwithstanding the provisions of the preceding paragraph, if a third party such as the assignee knew or did not know due to gross negligence that the manifestation of intention to restrict assignment was made, and the obligee of the assignee or other third party conducted enforcement against the claim referred to in that paragraph, the obligor may refuse to perform the obligation and duly assert against an attaching obligee any event that results in extinguishing the obligation such as payment to the assignor.