The level-number indicates the position of a data item in the hierarchical structure of a report group.
- 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.
- 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.