To make fields on a Placement, Applicant or Job record mandatory, a user can use the Workflow plugin which can be installed from the RDB Store.
📌 Note: Making fields mandatory on client records is not a current feature within RDB.
If you wish to have this functionality it would require the skills of our Professional Services Team to investigate and quote for custom work.
To request this please speak to your Customer Success Manager or Account Manager and include a summary of your requirement and what you are trying to achieve and why. Providing this information will speed up the time to move your request forwards.