All tableBASE/VTS user error messages are the same as the normal errors issued by tableBASE and are identified by codes in the tableBASE command area ERROR-CODE and subcode fields.
Level 1000 error codes
Some system error messages have been upgraded (by adding ‘1000’ to the error code) in order to reflect a specific VTS environmental problem. For example, 1072 – VTS access failed because the specified VTS is not available; the subcode provides a more specific reason for the unavailability.
For more information on tableBASE messages and error codes, see tableBASE messages.