Fanha, this will make the Sales Group has access to documents that has no supplier. So, documents that has suppliers will not be displayed. That, I don't think this is what you are trying to achieve. Baiju's answer maybe a better approach.

Hi John Doe, thx for feedback, have just update the answer, missing the partner object info. I need to hide all suppliers from the sale team. about the documents, what is documents? where can I find and check? regards.

Fanha, I used the word documents for instances/records of Sale Order, etc. Sorry, it is the normal lingo that I used with my team, shouldn't have used that term.

hi John Doe, yes, you are right. after apply it to the exist sale group, all other user who is belongs to that group will not see the supplier too. So I create a new group for that rule and add the specific user into that group. still not sure any other problem with this move.