Preventing only deletion (& not creation) of a project element

Dear PPM Experts,

We havefollowing requirement with reference to PPM project authorizations.

Project participant should be able to add a new project element (e.g. task, checklist item etc.) but should not be able to delete an existing element in the project.

By providing ‘Admin’ access via ACL (access control list), the participant gets ability to both Create & Delete an element.

Is there any standard way to prevent only deletion (& not creation) of a project element ? For example, via Security (PFCG) role / authorization object?

If enhancement is inevitable, which BAdI would work best?

Regards,

Bhusnan