Attempt to remove a Service Plan in PBA Provider Control Panel fails with the error message below:
Can not delete this Plan. It has Subscriptions.
The plan does not have active subscriptions.
The subscriptions based on the plan have statuses "Terminated/Removed", "Ordered/Not Provisioned", but are still present in the PBA database, thus blocking the Service Plan removal. PBA is Billing system first of all, and no records are expected to be deleted completely from PBA database (due to legal reasons, database consistency; financial documents may also be involved here).
The situation does not require resolution, nothing may be done here.
Provider may set the unnecessary Service Plan to unpublished, it will not be visible for end customers in the Online Store, it will only remain in the PBA Provider Control Panel.