Reversing Distribution Line in 11i, tax lines does not reverse

 HIIn 11i, when reversing Distribution line "ITEM" of AP invoice; it is not reversing the tax lines.

When we create Po match invoice, India insert tax program kick off and tax line generated; we expect when we reverse the distribution line (inserting negative Distribution) it should also trigger the concurrent and tax should be reversed or extra line with -ve amount should be generated.

Now we are not sure its std behaviour or its due to some bug.

Will appreciate any help on this.

thanks