change it to:
If ( taxable = "Yes" ; amount * sales_tax_rate ; 0 )
Adding in "sales_tax =" makes the result returned when Taxable = "Yes" to be a logical (boolean) expression comparing the value of Sales_tax to amount * sales_tax_rate with True (1) returned if they are equal and False (0) returned if they are not.
thanks; pretty silly of me...
one other thing though:
once I select one of the radio buttons it puts the sales tax amount in the field, but if I CHANGE the radio button from say YES to NO, the sales tax amount remains unchanged. How can I get it to change when the radio button changes?
This is a number field with an auto-entered calculation?
If so, either make it a field of type calculation or clear the "do not replace existing value..." auto-enter option.
thank you again!