This was a bug for us - we're on 9.05.607b. We're added it to a BPM we had on POSugg.Generate to set it to non-taxable when buy=true (probably would change it to a Data Directive if we didn't already have that BPM in place). This allows the buyers to update it to taxable if needed.
SCR88681 to fix this was supposed to be part of 9.05.700. I haven't tested it yet.
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SCR88681 to fix this was supposed to be part of 9.05.700. I haven't tested it yet.
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