SAP Message 5P330 - Return too long for tree maintenance. Read the long text

Diagnosis
A feature/subfeature with table return can have more than one line. Inthis case, table maintenance must have the 'NEXTR f' supplement. Treemaintenance automatically adds both this supplement, and the finalcomma or parentheses when you open the report, but requires space to doso. For this reason, the length of the table return values is limitedto 34 characters, or to 30 characters when you open the report.

Procedure
Enter table maintenance (again) (in the View function), and shortenyour entries accordingly.