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This has been broken for ages in Prestashop 1.7 and newer version does not fix it, making it extremely time consuming and impossible to use the suppliers tab on products. 

We use a PO module that we bought on the prestashop marketplace, that we have been using it since prestashop 1.6 where the suppliers option was working, however since upgrading to 1.7 it is almost impossible to use this.

We stock thousands of products, most of them are available from several suppliers / distributors. We spend time and manpower in filling out all information under the options tab. Each product in the back office have every suppliers unique SKU code and cost price entered and this is needed when we send purchase orders from the PO module as it sends the correct SKU code that the supplier for order that we raised with them and the price is used to double check that we are charge correctly

Beginning of the problem: Sometimes a distributors discontinues a product and we need to remove that supplier from a product / range of products, here is where the problem comes in. In prestashop 1.7 if you remove a supplier from a product under the options tab on the product in the back office it CLEAR ALL data from ALL suppliers, so you will then have to find all the SKU codes and prices for that product, and the various combinations that are available and insert them again from every supplier! 

How is this still not fixed? 

The most annoying part is that if you untick 1 supplier, it will wipe all the data even if you do not save, so if you accidentally add a supplier it will have to stay there unless you want to redo all the work again.