1. Reason: The operator is busy or forgets to sign, and the invasive operation involves many work links and steps. After the operator completes the operation, he may not be able to sign in time due to busy work or negligence. The signer is not at the scene, and the intrusion operation involves the participation and confirmation of many people. Due to other work tasks or affairs, the signer may not be able to confirm and sign at the scene immediately, resulting in the operation not being signed in time. For system problems, the signature of intrusion operation needs to be carried out in a specific system or file. If the system or file fails or operates improperly, the operation will not be signed in time.

2. Rectification measures: formulate perfect operation procedures, define everyone's responsibilities and tasks, and prevent signature omission caused by busy work and negligence. Strengthen personnel training and publicity, improve the working consciousness and responsibility consciousness of operators and signatories, promote the daily and standardized signing behavior, and reduce the risk of missing signing. For invasive operations requiring signature confirmation, it is necessary to ensure that the signer is present and sign in time to avoid the risk of omission and misoperation. Establish an effective management and supervision mechanism, strengthen on-site inspection and audit, ensure the timely implementation of operating procedures and signature confirmation, and timely find and rectify problems such as missing signatures.