Access Denied Sy-subrc 15 ✯ [ EXCLUSIVE ]

The most common reason for SY-SUBRC = 15 isn't that the file is missing (that would be code 8), nor that the path is wrong. It is almost always a conflict of identity.

When an ABAP program attempts to read or write a file on the application server using OPEN DATASET, it is not doing so as you (the human user logged into the GUI). It is doing so as the Operating System User that owns the SAP Work Process (typically sidadm on UNIX/Linux systems).

This creates a classic "Great Impersonation" scenario: access denied sy-subrc 15

| Operation | Context | |-----------|---------| | OPEN DATASET | User lacks authorization for file path/filename | | READ DATASET | File exists but access denied | | DELETE DATASET | No authorization to delete the file | | TRANSFER / CLOSE DATASET | Auth check fails during file operations | | RFC calls with file access | Authorization missing on target system | | ABAP statement AUTHORITY-CHECK | Explicit authorization failure |

If SU53 is empty (rare, but possible for background jobs): The most common reason for SY-SUBRC = 15

The Incident: A batch job ran every night to write CSV files to /tmp/export/. It worked for two years. Suddenly, every run fails with sy-subrc 15.

The Diagnosis: The developer checks OPEN DATASET. No change. The admin checks ls -ld /tmp/export. The sticky bit ( t ) is set

drwxrwxrwt 2 root root 4096 Oct 26 09:30 /tmp/export

The sticky bit (t) is set. On Linux, the sticky bit on /tmp means only the file owner (root) or directory owner (root) can delete or rename files. But the SAP user (a4hadm) owns the files inside. Why?

The Twist: Over time, the job generated 50,000+ files. The OS hit a limit on directory inodes. The directory became full of entries. The OS denied creation of new files because the directory's link count was maxed out, returning EACCES (Access Denied).

The Fix: Move the archive process to a dedicated directory structure (/sapmnt/archive/ instead of /tmp/), and implement a cleanup routine.

Lesson: sy-subrc 15 can be a symptom of resource exhaustion, not just permissions.