For PESs, reactive or nonreactive, the consistency of the electronic energy throughout the dynamical region is crucial. Generally, one electronic structure method is used for all sampling points, for a specified system. Additionally, detailed scrutiny and settings are carried out to make sure that the resulting energies are consistent everywhere. For some systems, different electronic structure For rOH > 2 Å, the single-reference method CCSD(T)-F12a/AVTZ predicts a wrong behavior and the MRCI-F12+Qrot/AVTZ method is used to obtain energies of points in this region.