How to control /3FB wage type

Hi All,

I am facing a problem in Er PF contribution wage type (/3FB). When for-period & in-period is 09.2007 & 09.2007 it is coming 14056/-. But when for-period & in-period is 09.2007 & 11.2007 it is coming 13149/-. Thats why the Er PF contribution is coming less in Form 3A.

Can anybody tell me why it is happening & where to check & rectify?

Thanks & Regards,

Nibedita