https://drive.google.com/file/d/1S-y2S9w_L_lfGAjgSdV3cQ4rOiCnIPY9/view?usp=sharing

In the image above which is the Odoo's source code, the POS has the components which I'm trying to retrieve with xpath "//OrderLine", but Odoo is telling me "//OrderLine" cannot be found. How would one select the component?

I'm trying to add additional elements in the component in the below screenshot:

https://drive.google.com/file/d/1xgw5rF0hi5gldLZqWUOAvxTNjhcYSoWE/view?usp=sharing

I have added a t-slot in the OrderLine in the below screenshot:

https://drive.google.com/file/d/1ldPzkXq-VhRYNiTnKDDzAj6dGNLsItXh/view?usp=sharing