Is It Okay to Group Different Roles Under One Job Description in an IT Company?

I have recently joined a new organization, and currently, we are working on the job descriptions in the company. It is an IT company. As far as I know, JDs are made for all positions in any organization. But my manager has told me to group jobs having similar functions/responsibilities and create just one JD for the grouped jobs. For example, if there is a junior and senior data administrator, create just one JD for an Administrator. Again, if there are different officers - like HR Officer, Finance Officer, IT Officer - group them under one job of Officer and prepare a JD just for the role "Officer." I want to know whether this is valid? I was under the impression JDs are to be prepared for all jobs. Please help.

Well, it's been since March 2012, no answer. Yes, you are correct. A job description needs to be prepared across verticals after a careful "Job Analysis." But typically in the Middle East, depending upon the company's requirements and functioning, they just make the job description based on their immediately open vacant position based on business requirements.

Creating Job Descriptions for Various Positions

I can see that your manager is looking at creating a "General JD" for positions vacant or filled. You may advise him to have different job descriptions for various positions as it will make sense in hierarchical structure levels. For example, Junior HR, Senior HR, and Assistant HR—what's the difference in job responsibility and KRA between all three if you have the same job description?

Wishing you all the best.

Regards,
Ukmitra