Having trouble recording data on options and futures through IB's api. This is what I enter in my attempt to open a connection to the April 11 130 Call on SPY for time and sales data recording. CONID: 82167858 Underlying: SPY Type: STK Expiry: 11-Apr Exchange: SMART Primary Exchange: NONE Currency: USD Multiplier: 100 Last Trade Date: APR 15 '11 Strike: 130 Right: CALL Local Symbol: 110416C00130000 So I have two unique numbers for this contract: CONID and Local Symbol. Everything is correct to the best of my knowledge. And still, I get this: "Error: SPY.SMART..USD Error Code: 200 Error Message: Invalid value in field # 541" There is no record or explanation as to what Field #541 designates. I have googled. I have searched the IB forum. I have done guess and check. Does anyone know how to approach this issue?