If you want the tolerance to be valid for everyone of a company, you can set the tolerance group blank.
If you want the tolerance to be valid for someone,you can name the tolerance group,then assign the tolerance group to a user.
Define tolerance groups for employees
Assign User/Tolerance Groups
Income Payments-Customer Tolerance
It is same with tolerance of vendor.
Tips: you should assign the tolerance group to a customer or vendor at master data.
Outgoing Payments-Vendor Tolerance
It is same with tolerance of customer.
GL Account Tolerance
Define tolerance Groups for G/L Acounts
Assign tolerance to GL Account-FS00