How to set AR Invoice line amount

SOLVED

Hello,

Need help with setting line amount for AR Invoice. 

retVal = oARInvoice.oLines.nAddLine();

 retVal = oARInvoice.oLines.nSetValue("ItemCode$", itemCode);

retVal = oARInvoice.oLines.nSetValue("Amount", amount); <--- Not sure what is the correct field to set