apply any credit balance bank.

[Alex16]

The Beneficiary may at any time apply any credit balance to which the Obligor is entitled on any account maintained with the Beneficiary

зачислить любой кредитный (кредитовый?) остаток?

[Pchelka911]

запросить положительное сальдо

[leka11]

вряд ли "запросить ..."
скорее так -
Beneficiary может списать any credit balance в счет покрытия sum due and payable from...but unpaid

более полный контекст из сети

"SET-OFF

The Beneficiary may at any time apply any credit balance to which the Guarantor is entitled to on any account maintained with the Beneficiary in any currency, in satisfaction of any sum due and payable from the Guarantor to the Beneficiary but unpaid."

[toast2]

речь снова о зачете (встречных однородных) требований