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Module: Expenses

Entity: hr.expense.sheet

Compute Method: _compute_main_attachment

Inputs Method Outputs 
for sheet in self:
            attachments = sheet.attachment_ids
            if not sheet.message_main_attachment_id or sheet.message_main_attachment_id not in attachments:
                expenses = sheet.expense_line_ids
                expenses_mma_checksums = expenses.message_main_attachment_id.mapped('checksum')
                sheet.message_main_attachment_id = attachments.filtered(
                    lambda att: att.checksum in expenses_mma_checksums
                )[:1] or attachments[:1]

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