Youre ok! Your lmia offer states that its permanent.I have only one job offer which is lmia based .I worked for one year n applied for PR under same job offer n lmia .I confused .
Your work exp letter though should have mentioned the full duties 'Mann Gill has worked from xxx date and is still employed. Works xx hours per week with a salary of xx and benefits xxx. His job duties are as follows: xxx,yyy,zzz etc etc'. And of course backed up by payslips and tax returns.