Error presented when copying a work item

Document ID : KB000102900
Last Modified Date : 22/06/2018
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Issue:
When the user wants to copy a work item, just like User story, the page will show red card error: 

Validation error: HierarchicalRequirement.Dropdownlist Value [ option 1 ] for field [ Dropdownlist ] is invalid. Valid values are: {[option 3, option 4, option 2, option 5]}

And the item is not allowed to copy.
User-added image
 

Environment:
As an example, the user may have a dropdown list field like:
User-added image

And the work item is using one of the value.
User-added image

But when the admin changes the dropdown list value:
User-added image
The work item will keep the old value and the new value could be found in dropdown list:
User-added image
But when the user copy this work item.
User-added image

The system will pop up the error message and not allow the copy action:
User-added image
Cause:
The work item has a value is no longer in the field anymore. In Agile Central, if a work item using a value in dropdown list field and if the value has been removed, the system won't remove the value from work item. It will be kept in the work item. And the system could not copy the work item which is using a value not exist anymore. So the system will pop up an error message like: 

Validation error: HierarchicalRequirement.Dropdownlist Value [ option 1 ] for field [ Dropdownlist ] is invalid. Valid values are: {[option 3, option 4, option 2, option 5]}

As the example error, HierarchicalRequirement.Dropdownlist means "Dropdonlist" field in User Story. The Value "option 1" is no longer in the field anymore. The existing values are [option 3, option 4, option 2, option 5]. 
 
Resolution:
Find out the field and change the value as existing, then copy the work item again.