Link arrow with UDO

Hi all, I need to create an hyperlink for a UDO but i dont' find a way. Below there are two string, the first it's for the UDO (that doesn't work) instead the second it's for items (that works).

'http://$b1$/link?table=@AZEX_OPRL&key='+totext({_AZEX_OPRL.DocEntry},0,'')

'http://$b1$/link?table=OITM&key='+{?Articolo@SELECT * FROM OITM}

Can anyone help me? it's possible do what i need?

Thanks a lot

Best regards, Antonio.