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Draft on a o-ring groove could not be deleted.
Solution
One option is to use the Resize Face option. Select the face and change the
angle to 89.999 .
90.0 is outside the allowed range.
Notes and References
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: DESIGN
Version: V8.0
Function: SYNC_MODEL
Ref: 002-7005757