Start with the opening position
Opening balance must be approved because every later transaction builds on it.
Match purchases and purchase returns
Returns and credits should reduce the payable position in the correct period.
Match payments
Link outgoing payments to the supplier and preserve payment-account context.
Review payment terms
A correct total can still be operationally risky if a large amount is overdue.
Investigate unmatched entries
Manual journals, duplicate purchases or missing credits should be resolved individually.
Confirm the closing balance
Document the reconciled balance and unresolved differences before the period closes.
The operating principle
Every event should remain connected to the product, contact or transaction that created it. That is what lets ERP explain a number instead of only displaying it.