Customer tries to place a sales or an upgrade order and selects more than one units of additional resource #123. Attempt to place order fails with the following error:
Max-Min value can not be greater than 1. Resource Upgrade from Resource #123 Resource A to Resource #456 Resource B must be deleted first.
There is resource upgrade configured from resource #123 to resource #456 or vice versa.
To see where it is configured:
PBA-E Provider control panel (or reseller control panel if resource belongs to a reseller) > Home > Product Director > Resource Manager > Resources > open resource > Upgrade to/Upgrade from
It may also be configured on the resource rate level:
Home > Product Director > Plan Manager > Service Plans > select plan > Resource Rates > select resource rate > Upgrade To/Upgrade From
Only resources with maximum units 1 and minimum units 0 can be composed in resource upgrade pairs: http://download.pa.parallels.com/pba/5.4/doc/57786.htm
Review the service plan and the resource configuration and either remove resource upgrade configured or reconfigure a plan to allow maximum 1 unit of resource #123 (depends on the result configuration required).