Hi @Inpriya01 ,
Based on the issue that you mentioned, I think you have some misunderstanding with the Owner field in CDS Entity.
Firstly, the Owner field is a System field in CDS Entity, the Owner field would be populated automatically by CDS System based on current user who create the record in the Entity. E.G. If User A create a record in a Entity, the Owner filed would be populated with User A automatically. If a Team member A create a record in a Entity, the Owner field would be populated with Team Member A automatically.
Note: When we create a record within a CDS Entity, we could not specify a value for the Owner filed manually, the Owner field would be populated automatically by CDS System.
In addition, the Owner field in CDS Entity is also a Polymorphic lookup type field, which could reference record value from Users Entity or Teams Entity.
Please check the following article for more details:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/working-with-references#polymorphic-lookups
Actually, whether or not a user (or a team) could edit a record in a Entity is based on which CDS Entity permission (corresponding CDS Security Role) has been assigned to this user (or this team), rather than based on what is the Owner field value.
Note: The Owner field value could be modified, please refer to here for more details.
More details about CDS Security Roles supported within PowerApps, please check the following article:
https://docs.microsoft.com/en-us/power-platform/admin/database-security
Best regards,