Hello Pascal,
As per my knowledge, There is no such field journal_entry_ids in standard account module. I guess you have created custom module and added field named journal_entry_ids in model account.bank.statement. To solve this issue, you need to add this field journal_entry_ids in form view of account.bank.statement.
And don't forget to update your custom module after making change in xml file.
Note- If you are using 6.1 version of odoo, then it was there in standard account module. for that I have suggested above solution to you.
Hope this will help you.
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--zbik
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