The type of integrity control (checksum, HMAC, encryption, digital signature) should be directly related to the risk of the data transiting the trust boundary. However, validation should be performed as per the function of the server executing the code.
For example, the web / presentation tier should validate for web related issues, persistence layers should validate for persistence issues such as SQL / HQL injection, directory lookups should check for LDAP injection, and so on.
For example, interest rates fall within permitted boundaries.
These definitions are used within this document: Ensure that data is not only validated, but business rule correct.
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To ensure that the application is robust against all forms of input data, whether obtained from the user, infrastructure, external entities or database systems. This weakness leads to almost all of the major vulnerabilities in applications, such as Interpreter Injection, locale/Unicode attacks, file system attacks and buffer overflows.
Business rules are known during design, and they influence implementation.
However, there are bad, good and "best" approaches.