Records needed for this question
Line-type codes, invoice totals and associated original transactions.
How to investigate
Recompute the invoice with signed values and verify each reversal against its referenced charge.
An illustrative review decision
A credit line and a positive charge can describe the same service period. Normalize their signs consistently before totaling exposure; otherwise the reversal may appear to increase rather than reduce the charge.
What can lead to the wrong conclusion?
Converting every negative amount to a credit can double-count a reversal.
The result to retain
A signed-line reconciliation and unresolved-code list.
Apply the review in context
Review carrier invoice evidence, inventory, findings and recovery cases in AuditRes Telecom.
This guide describes a human review method, not a claim that every scenario is automatically detected or executed. Explore AuditRes Telecom.