Define whether the Material can be used at which Sales and Distribution process

Here you define how the system responds when entering a sales and distribution document 
with this material in the differenet Sales and Distribution Process Flow.. 
You can use the material status, for example, to prevent orders from being entered for 
parts to be discontinued.
OR 
To temporary block the creation of Sales Order for a certain materials.
 
Set the material status parameters in transaction SM30, Table Views  V_TVMS.
Click Maintain and double click into the Materials Status code.
You can set three types of reponse for each Sales and Distribution process :-
1.  no dialog 
2.  warning when entering the document 
3.  error message (that is, the sales and distribution document cannot be entered on 
     the basis of the material status)