Modify the selected value of a customize field in bug template based upon transition between 2 states and value of another field

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Visual-Studio

custom-controls

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Hi,

I am trying to customize bug template by using ‘TFS Power Tool’. My requirement is to modify the selected value of a customized field (having some allowed values) based upon following conditions:

1. The transition (from OnHold State to Assigned).
2. Value in another field (Reason) should be equal to “Deferred”.

I tried to achieve by adding rules by using ‘TFS Power Tool’.

Tool=>Process Editor=>Work Item Types=>Open WIT from Server, select the work item.

On the work Item Type Page, click WorkFlow tab, double click a Transition (from OnHold State to Assigned), select Fields tab on the dialog, then added reference for the customized field.

Xml code for the above steps:

<transition from="OnHold" to="Assigned" for="[project]\Managers">
          <reasons>
            <defaultreason value="Assign" />
          </reasons>
          <fields>
            <field refname="Microsoft.VSTS.Common.ActivatedBy">
              <copy from="currentuser" />
              <validuser />
              <required />
            </field>
            <field refname="Microsoft.VSTS.Common.ActivatedDate">
              <serverdefault from="clock" />
            </field>
            <field refname="CustomField.PrimusStatus">
              <when value="More information" field="System.Reason">
                <default from="value" value="O" />
              </when>
            </field>
          </fields>
        </transition>

Now again if I change the value of Reason field, the value in custom field (CustomField.PrimusStatus) should change.
But i am not able to do it. Any suggestion to achieve this.

Thanks in advance for any help.