Comparison between calculated (this work, A_OO) and semi-empirical A-values (A_SE) for 3d⁸4p–3d⁸4d transitions of Ni II (Hartman et al. 2017). Scatter increases noticeably for transitions with line strengths below S = 0.01, reflecting the greater sensitivity of weak transitions to uncertainties in wavefunction composition and transition integrals. This behaviour is consistent with known limitations of transition probability calculations in regions of strong configuration mixing or low transition probability, where small inaccuracies in eigenvectors can lead to disproportionately large errors.