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Tax Calculation


Issue on Tax calculation

let us suppose i have posted a sales return order - 001 on 15-01-10 with tax 10%.......... on 08-02-10 i have created a new sales return order  for 30-01-10  with copy document with that last sales return order - 001............  but the the Tax % has changed to 8%  from 01-02-10 i require the system to post with tax 10% as it is for last month....but the system wil take posting date and calculate the tax.....Any help or Advice......


thanks in Advance