The IDE does not set correctly the error markers in files that are not associated with the Micro Focus COBOL project types. Instead of setting the markers on the exact lines that cause a problem, the IDE sets all of them on the first line of the respective files. To work around this issue, you need to add the unknown file extensions or the file names as file associations for the COBOL project types. To do this, click Window > Preferences. In the left-hand pane, click General > Content. Expand Text > Micro Focus COBOL Project Types. Add the file extensions in the File association pane.