Madgraph - Event generation

Hello all
i am generating events for BSM theory using madgraph at p-p collisions and i set the decay width of the new particles to auto, while the run i get this notification:-

"Please note that the automatic computation of the width is only valid in narrow-width approximation and at tree-level".

have i to care about this ?


MadGraph people have a forum of their own:

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thanks for suggestion