[support] Limit editing of custom cck fields

Hellos,

New to drupal. I have created a custom cck form, where information is filled by different users on the same form

User 1(with role 1) fills cck field A, B C, then user 2(with role2) fills in cck fields D and E. I have set permissions for the different roles where under the "content_permissions module" to allow users onl to fill fields that they have permissions to fill. User 1 works well and creates the node and fills only their fields.

When user 2 accesses the same node, they get "permission denied error". I solved this by enabling "administer nodes" under the "node module" permissions.

The problem I am facing is with this enabled, user 2 can edit user 1 fields. How can I stop this?

Thanks