```\nFile: VaultConfiguration.sol\n            if (vaultAccount.tempCashBalance < 0) {\n                int256 x = vaultConfig.primeRate.convertToUnderlying(vaultAccount.tempCashBalance).neg();\n                underlyingExternalToRepay = underlyingToken.convertToUnderlyingExternalWithAdjustment(x).toUint();\n            } else {\n                // Otherwise require that cash balance is zero. Cannot have a positive cash balance in this method\n                require(vaultAccount.tempCashBalance == 0);\n            }\n```\n