How To Fill Form IIIB Professional Tax Maharashtra

Dear Friends,
I need your help with regards to filling of professional tax monthly return using form III B provided by the MVAT department.
I have some doubts regarding periodicity field which period should be mentioned in this field.
Say if I’m making the payment of professional tax liability of Dec12 month (deducted from Dec12 salary) in the month of Jan13 before the due date, I’ll mention the same in field 7 computation of professional tax, under number of employees whose salary paid for the month of in Dec month.
If a select the periodicity of return as 01-12-2012 to 31-12-2012, it shows the validation error. However when I select the periodicity of the return as 01-01-2013 to 31-03-2013, file is validated.
What should be the periodicity of return for Dec12 month liability payment which is paid in Jan12? Please advise.
Best Regards

I Need Your Help With Regards To Filling Of Professional Tax Monthly Return Using Form III B Provided By The MVAT Department.
I Have Some Doubts Regarding Periodicity Field Which Period Should Be Mentioned In This Field.
Say If I’m Making The Payment Of Professional Tax Liability Of Dec12 Month (Deducted From Dec12 Salary) In The Month Of Jan13 Before The Due Date, I’ll Mention The Same In Field 7 Computation Of Professional Tax, Under Number Of Employees Whose Salary Paid For The Month Of In Dec Month.
If A Select The Periodicity Of Return As 01-12-2012 To 31-12-2012, It Shows The Validation Error. However When I Select The Periodicity Of The Return As 01-01-2013 To 31-03-2013, File Is Validated.
What Should Be The Periodicity Of Return For Dec12 Month Liability Payment Which Is Paid In Jan12? Please Advise.

I need your help with regards to filling out the Professional Tax monthly return using Form III B provided by the MVAT Department.

Thank you.