1. When I issue a receipt (debit note) or related documents, I will try my best to write all the contents myself. I can't save trouble for others to write the contents of the document. Sign it yourself. Otherwise, the contents of documents written by others are easy to be altered or changed, and it is difficult to conduct judicial expertise in case of disputes.

2. When the receipt (debit) slip needs to be written, the amount must be written in uppercase and lowercase, because the lowercase amount is easy to be tampered with, for example, it is not difficult to change 1 to 4 and 3 to 5.

3. When writing receipts (IOUs), the distance between words and lines should not be too large, and the margins of the paper should not be too large. Prevent others from using their own signatures to forge other documents.

4. Pay attention to the loan to avoid the other party's objection to the nature of the money received.

5. When issuing the above-mentioned documents or receiving (owing/borrowing) bills, try to use my pen, and provide evidence (witness) if a case is involved.

6. When someone gives you a receipt (debit note), you should not only ask the other person to sign and seal it, but also press the other person's handprint, so as to avoid others changing their handwriting and writing habits afterwards and bringing unnecessary trouble to future identification.

7. Pay attention to collecting and saving the signature documents of the other party at ordinary times, which can provide verification for future disputes.