Which rule does the following description come from?

Article 7 of "Several Special Problems in the Transfer of Organizational Relations":

Seventh, after the appointment and removal of posts within the party, the relationship between party organizations has shifted. According to the relevant regulations, if party member is approved by the organization to study full-time for a long time, he should generally issue a Letter of Introduction on the Organizational Relationship of China * * * Production Party party member, that is, transfer the formal organizational relationship. Party member temporarily went out for short-term study (such as attending a short-term rotation training class), but did not transfer the formal organizational relationship of party member, and the unit issued "Letter of Proof from party member, China * * *". Party member's certification letter is generally limited to use within six months after going out. If the formal organizational relationship has been transferred from the original unit, its party post in the original unit is naturally exempted, and there is no need to go through other dismissal procedures. Doing so will facilitate the original unit to conduct by-elections in time or transfer other comrades to vacant party posts.

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