Your code logic looks like it mainly addresses the handling of projected month-end stock values based on the current month in SAP DataSphere. However, there are some improvements we can make to ensure the logic for months October, November, and December works correctly. Below is the corrected and streamlined version of your SQL case statement:
```sql
CASE
WHEN A."YEAR_TEXT" = YEAR(CURRENT_DATE) AND A."MONTH_NUMBER" = MONTH(CURRENT_DATE) THEN