Amortized Vs. Expensed Asset

 We have few hundred Assets that have been Amortized in Corporate books, however we did not want to Amortize them in our Tax book. But while doing Periodic Mass Copy, those Assets were also Amortized. We want to do few things with those Assets in Tax Book now :

1) Revert back to Expensed Asset in Tax Book only

2) Change the Depreciation Method Code 

3) Change Cost

4) In future never Amortize any Assets in Tax Books

We tried using Upload Transaction Interface and also we tried using API to sytematically change them but we encounter this error : 

You cannot expense an adjustment to an asset for which you have already Amortized an adjustment.  Please Amortize this adjustment.