How to edit a BP created from "Create Blueprint Asset With Parent"?

Hello,

TLDR: this screenshot:

Context:

I am trying to automate my BP creation using an Editor Utility Widget (using Blueprint).
The aim is to easily create items for an inventory. An Item is bascially an UObject that embbeds a Data Asset.

So far, using “Get Asset Tools” → “Create Asset”, I managed to create a Data Asset, then a UObject from a UObject class I’ve created.
I can then edit that UObject I’ve just created using “Set Editor Property”, and set the Data Asset into that UObject.

Now, I would like to create an "actor Blueprint that I can drag and drop into my scene.
I’ve already created the BP_Physical_Item_Base that will get a Uobject / Data Asset, and get the mesh from them to display it on screen.

I can create the BP using “Create Blueprint Asset With Parent” but I cannot edit it using Set Editor Property.
It says, even if the var exists:
LogScript: Warning: Script Msg: Property ‘Quantity’ on ‘/Game/HAS/Items/Test.Test’ (Blueprint) was missing

Proof that the var exists: a screenshot of the BP created through “Create Blueprint Asset With Parent”:

I am trying and testing again and I do wonder if
“Set Editor Priority” is not just bugged.

Trying to change the BP_Actor in the CONTENT BROWSER (not in the world):

LogScript: Warning: Script Msg: Property ‘Quantity’ on ‘/Game/BP_Actor.BP_Actor’ (Blueprint) was missing

(Instance is editable and ‘Quantity’ is there and well spelt as you can see thanks to the Set Class Defaults of the same BP_Actor I try to change).

EDIT: I also tried with an already built-in parameter such as ‘NetPriority’ for instance. Same warning.

EDIT :

RESOLVED
The video I made in order to explain how to to that:

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