Entries appearing in Service Tax Control Account due to Error in System

Hello Experts,

I am facing a problem in one particular GL i.e.Service Tax Control a/c

error-Entries appearing in Service Tax Control Account due to Error in System

entries are- Service tax control a/c -

Dr. 21,621.86

To Service Tax Control a/c Cr. 21,621.86

My question is when i am making entry as Service tax Dr-21,621.86,Service Tax Cr.21,621.86,so it will adjust,and in FBL3N amt will show 0 but it was showing 21,621.86

Plz Guide me asap,very urgent issue

Thanks in Advance