Solution : https://service.sap.com/sap/support/notes/44978 (SAP Service marketplace login required)
Summary : 
      In SAP Note related to fiscal-year selection, the symptom discovered reflects incorrect intervals creation due to a program error within RFBNUM00. This has been addressed and resolved in version 3.0E. Users experiencing this issue prior to this version can apply advance corrections as a temporary measure until the update is deployed to ensure the accuracy and functionality of fiscal year data handling processes within their systems.
Key words : 
prerequisites program error solution corrected, additional key words rfbnum00, symptom wrong intervals, fiscal-year selection, advance corrections
Related Notes : 
       
| 175047 | Causes for FI document number gaps (RF_BELEG) | 
| 148757 | RFBNUM00 displays wrong gaps in document numbers |