Significance of Account Matching window

Hello,

Account matching is a tool to connect debit entries to credit entries on specific accounts, indicating transactions which are “open” - not matched, constituting account’s balance. 
In case of supplier account, e.g., we have supplier ledger open items report showing invoices and payments creating balance. In case of non-ledger accounts we can use account matching to provide similar result - show transactions impacting the balance.

In my current solution, account matching is used to connect entries on capitalized expenses account (expense invoices and asset acquisitions) to indicate entries not yet allocated to fixed assets.