what is the best way to find out unexplained balance

Summary:

we are using Balance comparison with transaction matching (Recon between Ledger to Bank)

at month end , Rec compliance module shows up unexplained balance

there is no hyper link on the amount of unexplained balance

would you please advise what is best practise to find out unexplained balance ?

is there out of box report which can tell this ?

or custom report ?

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