Access Denied Sy-subrc 15 -

In SAP ABAP, receiving a sy-subrc = 15 error during a file operation (commonly with the GUI_DOWNLOAD or GUI_UPLOAD function modules) indicates an ACCESS_DENIED exception.

DATA: lv_filename TYPE string,
      lv_rc       TYPE i,
      lv_os_error TYPE string.
Conclusion
The SY-SUBRC 15 – Access Denied error is not a mysterious system glitch; it is the SAP security model doing its job. It is a deliberate blockade to protect sensitive data and critical functions. access denied sy-subrc 15
AUTHORITY-CHECK OBJECT 'S_CARRID'
  ID 'CARRID' FIELD 'LH'.
IF SY-SUBRC = 15.
  WRITE: 'Access denied for S_CARRID'.
ENDIF.