Unable to get context in a custom forms R12

Hello,

We have this code in the PRE-FORM :

FND_STANDARD.FORM_INFO('$Revision: 115.3', 'High Volume Receipts Entry', 'XXRPAS',     -- ENHC0010395 Avant : RPAS_NAT
                       '$Date: 2003/09/29 11:20:00 $', '$Author: Oracle$');

mo_global.init('AR');                                                                    -- ENHC0011374

MO_GLOBAL.SET_POLICY_CONTEXT('S',NVL(MO_GLOBAL.get_current_org_id,FND_GLOBAL.ORG_ID));   -- ENHC0011374

                      
app_standard.event('PRE-FORM');

app_special.instantiate('SPECIAL1', '&Delete All', initially_enabled=>FALSE);

app_window.set_window_position('RPBATCHES', 'FIRST_WINDOW');

It works in one environment and not in a new environment.

Does anyone have any idea why?

Thanks Gaetane