Use the SetFieldEval macro to set the value of a single loan field by evaluating an expression using the Loan Custom Field Calculation syntax.
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                         Parameters:  | 
                    
                         
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                         Return Value:  | 
                    
                         
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                         None  | 
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                         Example: (Set the loan amount to the property value less the down payment)  | 
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                         Macro.SetFieldEval("1109", "[136] – [1335]")  | 
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