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I have a volume field that I need to have select the appropriate volume of solution based on another fields calculation (ie, based on BSA calculated, the volume field would select from two possible choices - for a BSA equal to or less than 0.6 m2 return 250 mL; if greater than 0.6 m2 return 500 mL).
Replace "BSA_calculated" in the code above with the name of the field you're using.
George