Select existing record from O2M panel-related

[JPaulMora (Juan mora)]

Hi, I have created a one-to-many relationship. Group->Bulto

I then created a panel-related like this:

this works and looks great:

But how do I let the user add existing records like in one-to-many? (see pic)

Thanks in advance

[hm-axelor]

Add canSelect=« true » to grid