CRM transaction BP dumps

Hi Experts,

I've a problem in transaction BP. Iv'e CRM 7.0.

When I open BP transaction and use BACK button (green arrow in the menu) a pop-up is displayed asking me if I confirm or not.

If I select "NO" there is a dump.

From St22 the error is "Unable to interpret "N" as a number." In fact the error is in LBUPA_DIALOG_JOELF44 report in which FM POPUP_TO_CONFIRM_STEP returns "N" in our case. After some rows there is this part of code:

IF ev_answer = 1.

ev_answer = 'J'.

ELSEIF ev_answer = 2.

ev_answer = 'N'.

ENDIF.

where ev_answer is a CHAR1.

When system tries to comapre N (a char) with 1 (integer) it dumps.

Do you know how to resolve this issue?

Thank you

Alessandro