[Nav 2016] Problems with xRec.Status

Hello,

i want to check if the status has been changed with this code below

[EventSubscriber] Warehouse Shipment Header.OnBeforeModify.Event(VAR Rec : Record "Warehouse Shipment Header";VAR xRec : Record "Warehouse Shipment 
IF (xRec.Status <> Rec.Status) THEN BEGIN
    ...
END;

But xRec.Status and Rec.Status has always the same value.
Other Fields of this recs are different but not the status?
Is this an issue or do I missunterstand something?