Known Limitations - B1 Validation System

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Events in the browser works a bit different from the normal events, as they are not blocking the UI. This makes it hard to make certain scenarios happened like Read Only.

List of events that does not work (there might be more):

Key Down

Form Key Down

Important: During validation events, it is not possible to block the event and force users to stay in specific field. We do not have a workaround for this new SAP limitation.
You need to re-work all your block validations to work from the add/update button instead.