Steps:

1. I created a new product and added Base price and custom prices for 2 customer groups
2. after some time I wanted to remove these custom prices because I don't need them and are optional.
3. I clicked edit and removed the values in Base price and Custom price column.
4. Fields are highlighted in red, but they are not required to save the form.
5. I clicked Update
6. These values are still displayed in preview.
7. Expected results: these values after update and deletion should dissapear.
8.