Compiler Error C0042 (Compiler Version <= 3.4.10)

Message: Either all or none formal parameter have to be denoted in function call

Possible error cause: The parameters are explicitly assigned to the function in the wrong order.

Error correction: Use uniform formal parameters or implicit parameters.

PROGRAM PLC_PRG
VAR
     i : INT;
END_VAR
 i := Test(iPar1:=2, 5);

FUNCTION Test : INT
VAR_INPUT
    iPar1 : INT;
    iPar2 : INT;
END_VAR