Thanks! I haven't got myself round coding yet, but yes I get what I need to do.

Hi Guiraiz, I agree with you! since my question is almost 4 years old and was answered by employees from Odoo, it would be nicer if a config option for this was already possible in the Standard version!

Hi Ricardo, hope you are keeping well. Sorry for the late reply, I was away on my summer holiday. So yes, I tried my best to follow what you advised. But at this stage I am still struggling. I understand the code editing at the back end but funny enough I still do not know how to access Odoo backend coding. I downloaded python 3.11 the other day, but did not get far, I did not find a clue how to open specific Odoo coding/backend access for the said field.
Also could you kindly advise if this can be done on python, I mean to say does your solution apply to the Odoo online version or some other Odoo version.