①After a person with qualified legal capacity who is involved in dealings with another party becomes a person with the legal capacity to act (meaning a person whose legal capacity to act is not subject to restrictions; the same applies below), the other party to those dealings may fix a period of one month or longer and demand that the person give a definite answer within that period of time as to whether the person will ratify an act that the person may revoke. In such a case, if the person fails to send a definite answer within that period of time, the person is deemed to have ratified that act.

②The second sentence of the preceding paragraph also applies if, before the person with qualified legal capacity becomes a person with the legal capacity to act, the other party to dealings involving the person with qualified legal capacity lodges the demand prescribed in the preceding paragraph with the legal representative, curator, or assistant of that person with respect to an act within the scope of their authority, and they fail to send a definite answer within the fixed period of time referred to in that paragraph.

③If a person does not send notice within the period of time stated in the preceding two paragraphs indicating that the person has completed any special formalities that an act requires, the person is deemed to have revoked that act.

④The other party to dealings involving a person with qualified legal capacity may lodge a demand with a person under curatorship or with a person under assistantship who is subject to a decision referred to in Article 17, paragraph (1) to demand that the person get the curator or assistant to ratify an act within the fixed period referred to in paragraph (1). In such a case, if the person under curatorship or person under assistantship does not send notice within that period indicating that the person has gotten the curator or assistant to ratify the act in question, the person is deemed to have revoked that act.