Fiscal year variant WK is incorrect

Hi,

I am trying to post entries to non leading ledger special periods for 2012 Fiscal year ( my non leading ledger follows jan to dec Fiscal year) , getting the below error

Fiscal year variant WK is incorrect

Message no. F5234

Diagnosis

When determining the posting period, a period was found that is not in the permitted area 1 - 16.

Procedure

Correct the fiscal year variant

Fiscal year variant WK, year dependent activated.

Periods: 53 + 4 special periods

Kindly suggest

Rgds

MGR