Transaction level 
	 
 
	  
		- In the drop-down list under Resources on the ESMAC menu, select 
		  IMS. 
		
 
 
		- Click 
		  Transact. 
		
 
 
		- Click 
		  Details for the transaction to be modified, or 
		  New if you are creating a new transaction. 
		
 
 
		- Select the appropriate value for the 
		  MFS Null field. Where you set this to [default], the value set at Enterprise Server level (see below) will be used. 
		
 
 
		- Click 
		  Add or 
		  Apply as appropriate. 
		
 
 
	 
 
	 Enterprise Server level 
	 
 
	  
		- On the Home page of 
		  Server Enterprise Edition Administration, click 
		  Edit next to the name of the enterprise server you want to enable. 
		
 
 
		- The Edit page that appears contains a hierarchy of tabs. Click the 
		  Server, 
		  Properties, 
		  MSS, 
		  IMS and 
		  TM tabs. 
		
 
 
		- Select the desired value for 
		  MFS null character field. 
		  
Note:  
			 You can override this value at transaction level. 
			 
 
		   
 
		 
 
		- Click 
		  Apply. 
		
 
 
	 
 
	 Note:  This task is only applicable if the codeset bias being used is 'ASCII'.