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.