The indexed file (I in position 35) defined on this line is processed by float keys. The Length-of-Key entry (positions 29-33) must contain a value of either 4 or 8 for a float key. When a file contains a float key, any type of numeric variable or literal may be specified as a key on keyed input/output operations. For a non-float record address type, you cannot have a float search argument.
For more information on record address type, refer to the IBM Rational Development Studio for i: ILE RPG Programmer's Guide.