Explanation:

The source document that is sent to provide information about the credit made in the account of the buyers, along with the reason mentioned in it, is a credit note.

Credit Note:
A credit note is a document that is issued by a seller to a buyer to indicate that a credit has been made in the buyer's account. It is used to adjust the amount owed by the buyer to the seller, usually due to an overpayment, return of goods, or any other reason for granting a credit.

Information provided in a Credit Note:
A credit note typically includes the following information:
1. Seller's information: Name, address, and contact details of the seller.
2. Buyer's information: Name, address, and contact details of the buyer.
3. Credit note number: A unique identification number assigned to the credit note.
4. Date: The date on which the credit note is issued.
5. Reason for credit: A detailed explanation of why the credit is being given, such as overpayment, return of goods, etc.
6. Amount: The amount of credit being granted.
7. Adjustment: The credit note may also indicate how the credit will be adjusted in the buyer's account, such as reducing the outstanding balance or issuing a refund.

Importance of Credit Note:
Credit notes are important for both buyers and sellers as they provide a formal record of the credit granted. They help in resolving any discrepancies or disputes regarding the amount owed and ensure transparency in financial transactions. For buyers, credit notes serve as proof of the credit received, which can be used for accounting and reconciliation purposes. Sellers use credit notes to maintain accurate records of credits issued and to update the buyer's account accordingly.

In conclusion, a credit note is the source document that is sent to provide information about the credit made in the account of the buyers, along with the reason mentioned in it. It helps in maintaining accurate records and resolving any discrepancies in financial transactions.