Unable to synchronize a subscription with a service plan: Unable to allocate the required amount of resources

Symptoms

• Unable to synchronize a subscription with a service plan:

  PLESK_INFO: Synchronization Failed
  Syncing the subscription with its service plan failed because some of the services or resources defined in the plan cannot be actually provisioned with the subscription.

• Complete Switching to the new Panel business model option exists in Tools & Settings > Plesk section:
  

• Unable to customize subscription resources with one of the following errors:

  PLESK_ERROR: Unable to accept the template: the following limitations are exceeded.

  OR

  PLESK_ERROR: Unable to allocate the required amount of resources.

Cause

The transition scheme to the new business model has not been applied after an upgrade from the Plesk version 11.0 or earlier.
Since Plesk 11.5 the resource allocation business scheme has been reworked a lot.

Resolution

1. Log into Plesk.

2. Apply the transition scheme at Tools & Utilities > Complete Switching to the new Panel business model > follow on-screen instructions.

The transition scheme can be also applied per customer:

1. After login into Plesk go to Customers > John Doe > Apply Transition Scheme:
   

Additional Information

Installation, Upgrade, Migration, and Transfer Guide, Parallels Plesk Panel 11.5: Completing the Transition