File Validation Exit Return Codes

Return Code: Description
0: Accept the volume unless the system finds a problem. The exit can set indicators in the parameter list (see Table 1) that mean that the system is not to ask the operator about expiration dates.
4: The exit takes no responsibility and the system continues usual processing.
8: Volume is not acceptable for this request. This should be used only when the system would otherwise accept the volume. For example Open, close, EOV checks security. This condition can also mean that the volume is not acceptable on this system. The system rejects the volume with a standard message that does not indicate the reason. This means to reject the tape if it is a nonspecific request or to issue ABEND if it is a specific volume request. The exit should write an appropriate message.
If bit TEPVABEND is also set, the system abends the job regardless of whether the volume request is specific or nonspecific.