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The diagram depicting the abundance ratios [Mg/Mn] vs. [Al/Fe] has gainedattention in recent literature as a valuable tool for exploring fundamentalaspects of the evolution of the Milky Way and the Local Group. In particular,this combination of elements is supposed to be highly sensitive to the starformation history (SFH), unveiled by the imprints left on those abundances.Unfortunately, a complete discussion on the uncertainties associated is stillmissing, making it difficult to know how reliable the associated results are.In this paper we analyze, by means of detailed chemical evolution models, thenuclear uncertainties of Mg, Al, Mn and Fe to show how different yields canaffect the trends in the [Mg/Mn] vs. [Al/Fe] plane. In fact, if different yieldassumptions produce conflicting results, then the [Mg/Mn] vs. [Al/Fe] diagramdoes not represent a strong diagnostic for the SFH of a galaxy. We discuss theresults on the [Mg/Mn] vs. [Al/Fe] diagram, as predicted by several Milky Way(MW) and Large Magellanic Cloud (LMC) chemical evolution models adoptingdifferent nucleosynthesis prescriptions. The results show that the literatureyields require some corrective factors to reproduce the APOGEE DR17 abundancesof Mg, Al and Mn in the MW and that the same factors can also improve theresults for the LMC. In particular, we show that by modifying the massive starsyields of Mg and Al the behaviour of the [Mg/Mn] vs. [Al/Fe] plot changessubstantially. In conclusion, by changing the yields within their error bars,one obtains trends which differ strongly, making it difficult to draw anyreliable conclusion on the SFH of galaxies. The proposed diagram is thereforeuncertain from a theoretical point of view and it could represent a gooddiagnostic for SFH if the uncertainties on the nucleosynthesis of theseelements (Mg, Mn, Al and Fe) could be reduced by future stellar calculations.

Galactic Archaeology with [Mg/Mn] versus [Al/Fe] abundance ratios -- Uncertainties and caveats