Return error from stored procedure

Hello All,
I am validating the user input data in the stored procedure. So, my question is how can I send multiple errors from stored proc and show it to the user.
We are validating user input data against database values.
For e.g. I am validating JobType and JobLevel and both are not valid then I want to send the error message as
Below fields are not valid JobType JobLevel OR like
JobType field is not valid JobLevel field is not valid I have added separate If conditions to validate the data.
Any help on this is appreciated !