“Tax included in price” without consequences.

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Situation: We get invoices from transport companies that have paid our VAT when
bringing goods over the border. The invoice line is for example “VAT payed 125.50”.
The tax I put on is “Vorsteuer (M&D) 100%” with a percentage tax of 100% as all of
the sum needs to go into the tax system. The tax “Vorsteuer /M&S) 100%” has “Tax
included in price” ticked in the definition. However, when calculating the invoice,
the system still puts 100% of the amount of the invoice line as a tax on top on the
invoice. This in my view is wrong.
Example: Invoice “RE2010/268”. Here I have corrected it manually. If you open the
tax line then you see that the field “Amount” is zero but the Tax Code Amount has
100% of the invoice line. This is in my view how “Tax included in price” should
operate. But maybe I do not understand “Tax included in price”.

I have made a workaround using child taxes. See Tax “Workaround Vorsteuer 100%
(M&D)” in francke_prd and invoice RE2010/351 with reference “TEST ONLY !!!”. The
parent tax removes the child tax for the invoice but the tax accounts are fed by the
child tax only. However, this is not very elegant as the base displayed of 246.46 is
technically correct but semantically nonsense. Further redundant lines are
introduced in the book keeping as can be seen in the relating move 1208 in the
purchase journal.

Could you please have a look at “tax included in price” and see if I have a
misunderstanding or if this is a bug?