    function _validateOfferExecution(
        OfferExecution calldata _offerExecution,
        uint256 _tokenId,
        address _lender,
        address _offerer,
        bytes calldata _lenderOfferSignature,
        uint256 _feeFraction,
        uint256 _totalAmount
    ) private {
...

@>      if (offer.duration == 0) {
            revert ZeroDurationError();
        }
        if (offer.aprBps == 0) {
            revert ZeroInterestError();
        }
        if ((offer.capacity > 0) && (_used[_offerer][offer.offerId] + _offerExecution.amount > offer.capacity)) { 
            revert MaxCapacityExceededError();
        }

        _checkValidators(_offerExecution.offer, _tokenId);
    }
