Thank you for your replay!
So I got this table with coordinates that help me buid my point layers (Hydrants). Each of this points has unique Id's. In the other hand I had this other table with multiples accessories (Hydrant components) witch had they unique ID's and also the ID of the point layer. So various accessories can be related to 1 hydrant (1:M). I built the relationship with this unique ID.
Know, the client is collecting new hydrants and adding new accessories. The problem is that this new points have the same ID (Default value= 9999). When new accessories are added, all of them have the 9999 default code who's the related ID.
I'm trying to find a way to make a random default value, take the value of the object ID or concatenate 2 values together when creating the point of the new Hydrant. I need an different ID for any new created point.
Tested Solution: Arcade it's creating a new field, I didin't found any examples to automatically calculate the field one new entries are done.
Any ideas?