The selected currency is not valid

[maxkatan]

Hello, I´m Having this error every time I save a product. 

The product saves all changes but shows the error on top.

[nnapier]

Hey, I know that this question is very old, but it ended up being the supplier that was associated with the product. I never really found a way to fix the supplier, so when I edit a product, I first uncheck the supplier and save. Then you will be able to edit the product and save it. Once you finish making your changes, just check the supplier and save again. Not really a fix, but a work around.