No valid reason. IN fact the A/P excise duty gets posted via the FI procedure. Its the way SAP has triggered it. But there are advantages in having the posting done directly from the SD procedure which is why the TAXINN is used. Here the rates can be defined at the condition record stage. Think of the number of tax codes you need to keep track off. With the condition technique you can control the way it works and that too automate it instead of picking up the tax code like it happens in MM.
Even sales tax is also determined from SD only. In FI, they just crete a tax code and value in FTXP. In SD only, you are defining as to how it should flow based on various combinations you maintain in UTXJ and assign the tax code.
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