Need to change Max Number of Chars in MPN field

[Steveio]

Hi,

I need to change the Max number of characters allowed in the MPN field for my products from 40 to 80.

I have changed the MPN length to 80 for the VARCHARS in my _product table in my database (see attached).

I have also changed the MAX_MPN_LENGTH to 80 in my src/Core/Domain/Product/ProductSettings.php file (see attached). 

My problem is that the backoffice is still only allowing me to add MPN numbers of up to 40 characters.

Does anyone know if I am missing something?

Thanks