Question on Tax G/L account determination

Hi Folks,

I would like to know how the tax Gl account was determined while a FI-CA document is posted?

In my system  current configuration the tax code is not assigned at sub trascations level but whene ever FICA docuemnt is posted the Off-setting GL items are created which inculdes tax GL accounts too.

Please let me know.

Thanks,

KRG