Positive information can consist of a payment history, or a reward loaded onto a tenant's credit profile
This information should be used to assess the prospective tenant's payment history and credit worthiness
Ultimately it is up to the landlord to decide whether to take on a tenant or not - different landlords may have different appetites for risk, meaning that one landlord may take on a tenant that another would decline, and vice versa.
The other points to consider when interpreting negative data is the date of the information, how many negative records vs positive records there are, and the Rand amount of the positive information.