Hi,
Do you use automatic budget posting? You should check these OSS notes:
1620682 FMFG_ABP017 for PBET commit.budget on change of PO del.date
1170291 Automatic Budget Posting: error message FMFG_ABP017
1329638 Message "Wrong Fiscal Year" during Automatic Budget
1265858 Message "Wrong Fiscal Year" during Automatic Budget Posting
1632145 Automatic Budget Posting: error message FM_FGABP017
Regards,
Eli