ISAM Error 2004

Hi there

Can anyone please tell me what this undocumented error is about in the Architect in ADS 11.

AQE Error: State = S0000; NativeError = 2004; [iAnywhere  Solutions] Advantage SQL Engine] [ISAM]ISAM error]

It's happening  on a Windows 8.1 machine when copying data from a table in one database to a table of the same name in a linked database.

It's a process I've done many times before on other machines, and if I run the select portion of the script then I get all the data, so it does look like an issue with the insert stage.  Folder permissions look fine.

Any help would be appreciated.

Thanks

John