Solution : https://service.sap.com/sap/support/notes/535168 (SAP Service marketplace login required)
Key words :
version & / & activity planning/qty planning, system displays error gu506, activity type planning, error message kl023, future fiscal years, fiscal year variant &, shortened fiscal year, attached program corrections, fiscal year, activity allocation
Related Notes :
| 672255 | Shortened fiscal year/changing fiscal periods |