In case we change the employee on an expense and in case expense has sheet which has only one expense_line_ids, then changing the expense.employee_id triggers changing the sheet.employee_id too. In case there are more than one expense linked to the report, then we unlink the expense line from sheet, (so that the user can create a new report). task - 2890095 closes odoo/odoo#94424 Signed-off-by: Kevin Baptiste <kba@odoo.com>