Work Definition view only- secondary quantity is updatable

Summary:

Created custom view only manufacturing engineer role which is working fine, except secondary quantity for operation items (input material / ingredient) is editable. If secondary quantity is updated, system is changing the primary quantity.

Content (please ensure you mask any confidential information):

We created custom view only manufacturing engineer role. Under Function Security policies, added only 'View Work Definitions' privilege for this role and removed all other privileges. This custom role is working fine, only able view the information and not able to update any details in the work definition. However, secondary quantity for operation items (input material / ingredient) are editable. If secondary quantity is updated, system is changing the primary quantity. Hence, we would like to make secondary quantity field also view only.