A FINRA arbitration panel ordered Securian Financial Services, the brokerage arm of MN-based Securian Financial Group, to pay an investor $2.4 million for failed investments in real estate limited partnerships.  The investment allegedly had been sold by one of its supervisors, Salvatore Joseph Durso, while he was engaged in outside business. The investor had sought $4.2 million in compensatory damages, claiming the firm and broker on charges of misrepresentation, failure to supervise, unauthorized transactions and unsuitability.   During the arbitration hearings, the claimants informed the Panel that they settled their claims against Respondent Salvatore Joseph Durso. What Went Wrong. The customer went to a Securian adviser in 2003 to develop an investment plan according to his attorney.  The adviser recommended buying $4.2mn in promissory notes issued by real estate limited liability companies.  By 2006, the notes became worthless.  Adviser Durso sold the notes through an outside business that the firm failed to supervise.  The customer did not realize the investment was not a Securian product. For additional information, go to  [Reuters 11/23/11].