Hello,

I am modifying the pos_self_sale_order module (pos-self), and I'm trying to add partner_id information to a previously identified user. However, the object I store as partner_id is always "magically" converted into an integer.

This only happens with the partner_id field (e.g., session_id works as expected). I’m trying to figure out what’s missing or what needs to be changed so that the object I pass doesn’t get overwritten.

Here’s a snippet where the issue occurs:

```
          this.currentPartner = this.models['res.partner'].create(this.addressData);
          // some not related stuff

          const order = this.models['pos.order'].getBy('uuid', this.selectedOrderUuid);

          order.partner_id = this.currentPartner; // currentParnter is Proxy <Target>{ id: 77, ... }

          return super.sendDraftOrderToServer(...arguments); // Here partner_id magically is set to 77

```
Kind regards