1902.02(b) Basic Application or Registration Number 
The international application must include the filing date and serial number of the basic application, or the registration date and registration number of the basic registration. 37 C.F.R. §7.11(a)(1). The USPTO will not certify the international application if this information is incorrect or is omitted.
The international application must be based on an active application and/or registration. It cannot be based on an abandoned application, or on a cancelled or expired registration.
An international application may be based on multiple basic applications and/or basic registrations. The relevant dates and numbers of each application and/or registration must be included. The USPTO will not certify the international application if any of this information is incorrect or is omitted.
If a basic application and/or registration has been divided, each serial number and/or registration number must be identified. If, after the international application is filed, a basic application and/or registration has been divided, the USPTO will notify the IB of the serial number of the new child application and/or the registration number. See TMEP §§1110 et seq. regarding division of U.S. applications, TMEP §§1615 et seq. regarding division of U.S. registrations, and TMEP §1902.12 regarding division or merger of basic application or registration.