The certificate needs to be stamped by the party organization to which the person under investigation belongs.
Certificate of letter transfer means that the party organization needs to solicit the opinions of the grassroots party organization in the unit where the person works or the place where the person is registered through a letter of letter during the political review of the person who is planning to join the party, so as to understand his political performance, Family situation, etc.
The letter of transfer certificate usually needs to be stamped by the party organization where the person under investigation belongs to prove the political performance and family situation of the person under investigation.