5      11
     ---- -- ---- ----
    |XXXX|  |XXXX|LMTS|
     ---- -- ---- ----
          |        |
          |        |_(1)Compulsory Data Category Keyword(A4)
          |
          |_Optional User Identifier(A2)

(1) If NONE is entered for the data category keyword, the program assumes default values.