While I haven't attempted this, have you tried:
ROUND(({Sales Transaction Amounts History:Extended Price} /{Sales Transaction History:Subtotal} *{RM Apply History File:Write Off Amount}), 3)
While I haven't attempted this, have you tried:
ROUND(({Sales Transaction Amounts History:Extended Price} /{Sales Transaction History:Subtotal} *{RM Apply History File:Write Off Amount}), 3)