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It is not possible to move a Datum Feature Symbol along the attached
edge/extension line.
Solution
Select the symbol and while holding down MB1, press Shift and you can move the
symbol.
Notes and References
Hardware/Software Configuration
Platform: na
OS: n/a
OS Version: n/a
Product: NX
Application: DRAFTING
Version: V1847
Function: GD/T
Ref: 001-7230913