due date in consumption journal not work

Hi guys i try to get due date in release production order come or transfer  in consumption journal automatically but it not come i don't know the problem :

what i need is to transfer date found in release production order (due date) to posting date in request form  of calc consumption(function-cal consumption-option-posting date) in default it take work date but i need due date in place of work date. so that i write this code to achieve this task

in open form of request form of report 5405

IF "Prod. Order No." = '' THEN
  EXIT;

ProdOrderLine.RESET;
ProdOrderLine.SETRANGE(Status,ProdOrderLine.Status::Released);
ProdOrderLine.SETRANGE("Prod. Order No.","Prod. Order No.");
IF ProdOrderLine.FIND('+') THEN
due_date:= ProdOrderLine."Due Date" ;

then i replace workdate with due_date global variable as date data type

InitializeRequest(due_date,CalcBasedOn::"Expected Output");

then

in createconsujinl function i write

  ItemJnlLine.VALIDATE("Posting Date",due_date);

but when i run and open request form again after i make release production order  and got to consumption journal it give me empty posting date text box

why and how i solve this problem.

thanks