Delivery block status text

Hi,

I need to get text for the field "DELIVERY BLOCK STATUS" under the tab "Shipping" in transaction VA03.

The delivery block status is saved in VBUP-LSSTA and possible values for this are space,A,B and C.

However in tarnsaction it is displayed as BLOCKED,Not blocked as shown in below fig.I want to know where these values for staus text are saved in system and how to retrieve them?