Action to be performed on multiple objects

Hi All,

  We have created a CancelTR.jsp(TR is nothing but OB) to cancel any particular Order Base via Action on OB screen. However, before cancelling OB, user should enter comments in this free textbox on CancelTR.jsp why he is cancelling the OB.

Cancel TR Action:

CancelTR.jsp

Single OB is working fine, user entering comments for one OB,  status change is happening on background using Agents and getting cancelled.

However,  when user selects multiple OB's(say selected two OB's) and clicks this CANCELTR action, it is failing(only one OB is cancelled, other is still in same status). I think, some problem with Parameter name field here?