Symptoms

PBA-E upgrade to version 5.5.x fails with:

    We have detected a misconfiguration in your service plans. Currently you have configured switch plans for Domain Registration plans. Before continue with upgrade procedure, please either remove all these plan switches manually or mark this pre-check as approved: in this case  those plan switches will be removed automatically. The list of Domain Plans with configured switch plans:
    The list of Domain Plans with configured switch plans:
    Plan #ID PlanName under vendor #ID 
    Plan #ID PlanName under vendor #ID 

Cause

Switch plan for domain subscriptions is not supported since PBA 5.5 version

Resolution

Either remove all configured Domain Plan switches manually, or mark this pre-check as approved by going to PBA System Information > Support > View Ad-dons > Check Switch Plans for Domain Plans > Edit, and set version to which upgrade is performed, then domain plan switches will be removed automatically.

Internal content