Recently discovered triplet superconductor UTe2 exhibits such unusual properties as point nodes TRSB (time-reversal symmetry breaking) and reentrant superconductivity. Recent experiments confirmed a single superconducting transition corresponding to the one-dimensional nature of its SOP (superconducting order parameter). However, existing phenomenological approaches representing Cooper pair and SOP with the same model functions are not able to represent a one-dimensional SOP with TRSB. It is shown that for each real IR of the group D2h or ICR (irreducible corepresentation) of magnetic group mAmAm one can construct real and complex SOP, both being one-dimensional. Hence, it follows that the experimentally obtained one-dimensionality of the order parameter of UTe2 does not call into question the experimentally established TRSB in this superconductor. Based on the approach of the present work, which combines group theory with the topological phase, recent experimental results on the structure of the SOP of UTe2 are discussed.