-50: Lock request timeout

Explanation:

The lock request or an implicit lock conflicts with the locks of another user. The maximum waiting time for being granted the lock has elapsed (special database parameter REQUEST_TIMEOUT).

User Action:

In some cases, the error message contains a more detailed description of the error.

The lock request can be reissued, To avoid possible deadlock situations, it is advisable to roll back the transaction using a ROLLBACK statement.