Dear Khun Patchaya,
For control perspective, please understand that all backdating signatures are inappropriate control and unacceptable practice ka.
The review signature should be the procedures to indicate that the operation actually performs the review before signing the documents.
The signature for review or approve should be in the time period required.
For obvious reason and intentionally backdating sign/backdate documents would be considered as a fraud ka.
Dear Khun Chamaporn,
Please consider the request from Khun Patchaya na ka.
Also, please kindly ensure that other staffs understand the reasons of this matter as well ka.