Credit Memo-On Account & Credit Memo Invoice Settlement Methods.

While settling a deduction using Credit Memo Invoice settlement Method.

I am unable to select the Tax Code Or The Action about Calculate Tax.

The Use Guide states

"Tax Calculation feature is available only when settlement method is On Account Credit Memo, Debit Memo or Return Material Authorization. "

So How will I settle the Deduction so that the claim is completely closed (with out any open balance) & at the same time the Credit Memo is created in AR with the correct Tax on it.

Consider the below Scenario:

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Invoice 123 is entered in AR with two lines on it as below.