Good morning We have realized that if a cataloguer make a mistake in specifying relationship between authorities detail.pl becomes crazy and could system down koha. Explanation When cataloguin an authority we can set up relationship between them using 550$w and adding a valu (generic, narrower related) Obviously 2 terms can't be generic between them, if a cataloguer make a mistake and add $w in both, when somebdoy goes to see the authority it creates a bucle without end. it could be prevented using authorised values, but I think it is a weakness of the system. This conf make system sown Genealogía (generic) Historia Historia (generic) Genealogía Kindest regards