Context
The constraints are as follows:
The new supplementary offering must have the dependency relationship with the primary offering.
If you want to change several supplementary offerings, you must specify the effective time for each new supplementary offering.
The expiration time of a supplementary offering cannot be earlier than that of the primary offering.
The new supplementary offering takes effect in one of the following modes:
Immediately: only for subscribers in the Idle state
In the next bill cycle: only for subscribers in the Active state
At the specified time: only for subscribers in the Active state (The specified time must be later than the current time.)