Ernesto, a Filipino citizen and a practicing lawyer, filed his income tax return for 2007 claiming optional standard deductions. Realizing that he has enough documents to substantiate his profession-connected expenses, he now plans to file an amended income tax return for 2007, in order to claim itemized deductions, since no audit has been commenced by the BIR on the return he previously filed. Will Ernesto be allowed to amend his return? Why or why not?