Calling batch program interactively

I need to call a Lawson batch program PR530 interactively from a non-lawson program. I had initialized the lawson environment within the program and called the program with the entry parameters E@ENTRY@CNTRL and E@ENTRY@SCREEN populated. But the program ends abnormally on the U@@INITBATCH procedure with pointer not referenced error. What could be the reason for this?