UDT Expression Tag Using OPC Tag Path Error

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To me it looks like your first abs is missing its ending enclosing paranthesis (adjusted for better readability):

// Current Unbalance Formula
// Calculate Absolute Maximum Deviation of Phase Currents
(max(
	abs({[.]CurrA} - {[.]CurrAvg}),
	abs({[.]CurrB} - {[.]CurrAvg}),
	abs({[.]CurrC} - {[.]CurrAvg})
// Divide by Current Average Magnitude * 100 for %
) / {[.]CurrAvg}) * 100
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