Ive spent literally weeks adding a complete catalogue to shopify and have carefully marked products as custom (yes ive gone through and checked the boxes) however every time i come back to the website to do some more i find a ton of products with an error message saying i need to add a GTIN / MPN.
ive been clicking on the individual products and then unchecking and rechecking the custom product box and that fixes it for a little while and then boom, errors all over again.
This morning it was nearly 800 products. No way can i go into all those and individually uncheck, save, recheck and save again.
Whats causing this mess and how do i stop it, failng that is there someway of marking bulk products as custom so i dont have to resave all the individuals.