VSAM is unable to maintain positioning after every logical error. Whenever VSAM does not maintain positioning after an error request, you must reestablish positioning before processing resumes. After a direct or sequential access request that resulted in a logical error, positioning can be in one of four states:

Yes

VSAM is positioned at the position in effect before the request in error was issued.

No

VSAM is not positioned because no positioning was established at the time the request in error was issued.

New

VSAM is positioned at a new position.

U

VSAM is positioned at an unpredictable position.

Undefined

The reason code is undefined.