Error when LinkedObject=61

Hi all,

I have editText and a linkedButton. EditText is bounded to profit center and I want the linked button to show me profit center also.

so I found in enum BOlinkedobjects that ifprofitcenter=61

but when I try this value, there is an error

"Item-invalid target". I have version 2004c.

So, how can I link the linked button to profit center, when this is not working???