The level-number indicates the position of a data item in the hierarchical structure of a report group. 
                  
 
            
            
               General Format
 
               	  
               	  
 
               
              
            
            
               Syntax Rules
 
               	  
                
                  	 
                  - A level-number is required as the first element in each data description entry. 
                     	 
                  
- Data description entries subordinate to an RD entry must have level-numbers 01 through 49 only. 
                     	 
                  
  
            
            
               General Rules
 
               	  
                
                  	 
                  - The level-number 01 identifies the first entry in a report group. 
                     	 
                  
- Multiple level 01 entries subordinate to a report description entry having the level indicator RD do not represent implicit
                     redefinitions of the same area.