You have configured a Validation warning message on a pop-up (e.g. a quick create screen, add products, etc.) list to be displayed upon Save, however this warning message is displayed too fast and doesn't allow enough time for users to be able to read it.
SAP Hybris Cloud For Customer
Validations are supported for pop-up lists on experimental basis. We use the standard messaging mechanism to indicate the warning, but it will be overridden by other screen/messages.
Standard system behaviour.
Validation Warning, Pop-Up List , KBA , AP-RC-UIF-FLX , Page Layout & Key User Configuration , Problem
SAP Cloud for Customer add-ins all versions ; SAP Cloud for Customer core applications all versions