Admin Product custom tab display error

[eriqx]

Hi,

I have custom tab added in Admin Product page via module. I am using hookActionProductUpdate to validate and process data. Now I need to display error message when something went wrong but I don't know how. Right now when I hit save and stay the message says Update was successful, there I need to show my custom error message.

Can someone help me?

Thanks

[Enrique Gómez]

I'm using

throw new PrestaShopException("my message");

inside the hookActionProductUpdate and it works well for me. It shows "my message" in the errors box.