Root level field levels are not showing in the layout positions extract

[yruslan]

Describe the bug

Here what it looks like:

-------- FIELD LEVEL/NAME --------- --ATTRIBS--    FLD  START     END  LENGTH

RECORD_COPYBOOK.                                             1     30     30
  5 GROUP_1                                           6      1     30     30
    6 FIELD_1                                         2      1     10     10
    6 FILLER                                          3     11     15      5
    6 GROUP_2                                         6     16     30     15
      10 NESTED_FIELD_1                               5     16     25     10
      10 FILLER                                       6     26     30      5

Here is how it should be:

-------- FIELD LEVEL/NAME --------- --ATTRIBS--    FLD  START     END  LENGTH

1 RECORD_COPYBOOK.                                  1      1     30     30
  5 GROUP_1                                         2      1     30     30
    6 FIELD_1                                       3      1     10     10
    6 FILLER                                        4     11     15      5
    6 GROUP_2                                       5     16     30     15
      10 NESTED_FIELD_1                             6     16     25     10
      10 FILLER                                     7     26     30      5

^ See the number '1' near 'RECORD_COPYBOOK'