Thank you for the prompt reply, as always.I had the same sort of issue with one of my work references - they issued a "standard" letter of service that did not mention the salary or the hours worked per week. I simply included a copy of my original contract with the company, as those facts were mentioned there. So yes, you can include the letter with the job description from your boss. And if your original contract has the job descriptions, include that too.
Will the date of the certificate of employment matter? I requested my COE from previous employer way back 2016' Because I can submit my certificate of clerance from my previous employers as this has a salary specified on it. The problem is, this was issued after my resignation which was years ago.