Error -640: QPLAN sanity faiure (1503.0)

Dear Informix Gurus, hopefully not everybody is away at the IWUC, so someone will hear my cry for help! I just upgraded from Online/Star 5.01 to 5.03, and now I suddenly encounter the above error in a 4GL program which had been running without a glitch for years! The database is running on a Siemens-Nixdorf RM400-10 under SINIX 5.42, and the 4GL program is running on a Siemens-Nixdorf RM400-330 under SINIX 5.42. 4GL Version is 4.10, and INet version on the client is 5.03. The error occurs after the following piece of code: BEGIN WORK DELETE FROM vertrag WHERE stellennr = aend.stellennr AND v_begin = aend.v_begin AND persnr = pnr following is a long INPUT statement, after which an INSERT follows. Depending on the result of the INSERT, the transaction is committed or rolled back. I didn't write the program myself, but I can see nothing wrong with it. Finderr isn't very helpful. It just suggests to contact technical support. Please help me! Regards, Richard -- +----------------------------+-------------------------------------------+ | Dr. Richard Spitz | INTERNET: spitz@ana.med.uni-muenchen.de | | EDV-Gruppe Anaesthesie | Tel : +49-89-7095-3421 | | Klinikum Grosshadern | FAX : +49-89-7095-8886 | | 81366 Munich, Germany | | +----------------------------+-------------------------------------------+