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1. Open the JIRA issue.

   Talk
   id talk-897

2. Switch to the TeamCity tab.
3. Locate the build that you want to enter into the Fixed in Build field.
4. Hover over this build.
5. Click the Assign the build number to the custom field icon.
   
6. In the Assign build form, confirm the operation. If you have multiple fields of the same type, you will be prompted to select the field you want to populate.
   

   Talk
   id talk-899

7. The build number will be populated into the corresponding field.
   

   Talk
   id talk-900

If the field already stores some build number, the old value will be rewritten.