UDT usage in SCL illegal data transfer Error

Hello Expert,

i have illegal data transfer error while i compile below code and please point me where i did mistake . That is only self homework and thanks in advance.

TYPE VALVE
STRUCT
OP_LS : BOOL ;
CL_LS : BOOL ;
AUTO : BOOL ;
MANU : BOOL ;
OPENED : BOOL ;
CLOSED : BOOL ;
Q_SE : BOOL ;
Q_ERROR : BOOL ;
END_STRUCT;

FUNCTION_BLOCK BDV_TEMP // FB 1

VAR_IN_OUT
BDVTEMP : VALVE ;
END_VAR

BEGIN

IF BDVTEMP.OP_LS AND NOT BDVTEMP.CL_LS THEN
BDVTEMP.OPENED := TRUE ;
BDVTEMP.CLOSED := FALSE ;
BDVTEMP.Q_ERROR := FALSE ;
ELSE
;
END_IF;
END_FUNCTION_BLOCK

FUNCTION_BLOCK BDV_TEMP_CALL // FB 2

VAR_IN_OUT
BDV509 : VALVE ;
END_VAR

VAR
VALVE1 : BDV_TEMP ; // CALL FB1
END_VAR


BEGIN

VALVE1 (BDVTEMP := BDV509);

END_FUNCTION_BLOCK

You cannot "pass on" an in_out UDT to another FB. See the following related thread:

http://www.plctalk.net/qanda/showthread.php?t=76423&highlight=pass

As always, many thanks LD. even i read your link and screen shot, still i don't get it. Can i have sample project or coding?