What is the fine-grained topic of the following text: Since part categories are the result of international bilateral agreements which are subject to frequent renegotiations and changes, we suggest that you check, close to the time of shipment, the Status Report On Current Import Quotas (Restraint Levels), an internal issuance of the U.S. Customs Service, which is available for inspection at your local Customs office. Only return the topic.
Checking the Status Report On Current Import Quotas for Updates on Part Categories due to International Bilateral Agreements