Perhaps there is someone here for whom this makes sense; but I for one don't know how your tax system works, what your abbreviations other than VAT refer to, why an accounts system would not allow you to change rates, or why you would want to.
Please explain the situation and your goal in more detail, without assuming everyone knows everything you know. Be as complete as possible.
Specifically, we need to know what you can control in your accounts system, and what result you want. What input would you expect to modify, in order to get the result you want? And what is it that you want to calculate? Or are you just asking how to manually find what the actual VAT rate is, or whatever?
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