In the Add/View Constraint window, the state Rely/Norely is not available.
Steps to Replicate:
1. Open DB Navigator
2. Go Constraints section
3. Click right button | New Constraint window appears
4. Select table, enter contraint name, select Primary Key or Foregn Key constraint
5. A window to select constraint details will appear. In the lower left corner, there are several checkboxes to select constraint state (Deferraable, Initially Deferrred, Disable after create), but there's no way to select Rely state.
Waiting for fix in a future release of SQL Navigator for Oracle.