Forms :: Go_Item OS Linux Mint

I am running forms 6i in Linux Mint environment. I used Go_Item('emp_cod') after commit on save button.

Code is as under:

IF NVL(:BAL_QTY,0) > 0 THEN
GO_ITEM('EMP_COD');
ELSE
GO_ITEM('OP_ID');
END IF;

Control moves in relevant item but there is no cursor indication and no data can be entered in this field. When I press TAB or ENTER key the code written on Key-Next-Item executes properly. It means that control moves to that item but nothing could be written in this. This form is working properly in Windows environment.