Solution : https://service.sap.com/sap/support/notes/490859 (SAP Service marketplace login required)
Key words :
directory /general/r3server/abap/note, add changing interface parameter p_email_accunt, create input field gv_email_account, 'company number' input fielddef, 'form' radio buttontext-id, 'form' radio buttonobject, gui' radio buttonfile, frontend' radio buttonfile, function module rv_ftt_gov_intra_data_sender, attached advance corrections
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501667 | INTRASTAT Belgium: missing characters for ID number |
496742 | Incorrect form formatting or form contents |
484042 | INTRASTAT Belgium:mode of transport mssng in declaratns f 01 |
433168 | Intrastat Belgium: Legal changes as of January 1st, 2002 |