Details
The user cannot unite several bodies using "Unite" command because of the following error
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Circular dependency detected
Did you try to modify the base body using something derived from an extracted or linked feature?
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Solution
If you have any up-stream features like "Extracted face" or "Linked body" that has "Fix at Current Timestamp" checked OFF, Please check it ON and try Unite which should solve the issue.
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 1064
Product: NX
Application: DESIGN
Version: V11.0.1
Function: FEATURE_MODEL
Ref: 002-8015426