open function from list parts

[leggera]

Good morning.

How come if you click with the dx button on an item of a separate base in almost all cases there is the open function (open the part ) and in others not?
thanks for the attention.

 

[batleo]

Hi.
I believe that in the case of the left image no row is selected

 

[leggera]

the problem does not arise today.
I think it depends on the same definition of the description.