A GS1 warning does not stop you sending the product. It is a warning from the data pool, often about a rule that is not yet blocking.
On the product, click the GS1 warnings light to read the message. The text is stored in X9007. The light is not shown on a Norwegian product.
The product menu has an overview of products with GS1 warnings.
The other lights: How do I read the status indicators on the product sheet?.