Access the sales party for table HZ_PARTIES for all standalone contacts in the enterprise

Summary:

Need complete explanation of this Data Security Policy "Access the sales party for table HZ_PARTIES for all standalone contacts in the enterprise"

Content (required):

We have a contact associated with an account. When we search the contact registry ID using "Sales and Service Access Management" explore access, we got this DSP access "Access the sales party for table HZ_PARTIES for all standalone contacts in the enterprise". But this contact is already associated with account. What is the explanation of this DSP? Why a particular user can see the contact using the above access?

Version (include the version you are using, if applicable):