Error while activating in DSO, FIGL, only some months

Dear Colleagues!

I have an activation problem in an ODS, three differnt months loaded isolatedreturns with error when I activate. The error only occurs in June, July and august of 2004. 2005, 2006, 2003, 2002, 2001 and the rest of 2004 loads and activates fine!

<b>Error messages:

Error when assigning SID: Action VAL_SID_CONVERT table 0ORG_DOC_YR

SYST: Period 001 is not valid in financial year variant K1</b>Process 000108 returned with errors

Activation of M records from DataStore object ZFIGL_O2 terminated

Do you have any suggestions what this can be, or suggestions on what I can do to fins out more about this? And why it failes for these three months and not the rest of the years?

Regards Silje