How to hide a tab of an item?

For the Item Part, for the all the part numbers, I need to hide a specific tab, lets say "Goals" for a specific identity. 
"Goals" is under Relationship Types in Part item. I have tried:
- Right click on the Goals in Relationship Type,Permissions--> Access Report, edit Permissions named "Relationship Type". Add identity, here to Permission named "RelationshipType" and give no rights to the identity. The tab still shows.