Error in a 4GL-report

Hello INFORMIX-Gurus, I've posted this question twice, but got no response. So this is my last try in hope to an answer. I've written a report called "r_red". Sometimes this report produces an error (but it is not reproducable): Program error at "repvfg.4gl", line number 796. SQL statement error number -242. Could not open database table (scheer.t_r_red). SYSTEM error number -113. ISAM error: the file is locked. In line number 796 you can find a "START REPORT r_red". I have never created a table "scheer.t_r_red", so I think its a temporary table made by INFORMIX at runtime. But why should this temptable be locked by another user??? Can anybody explain the mechanism when starting a report??? In the rootdbs and in the filesystem pointed to by the DBTEMP variable is enough space (~ 40 MB). So I don't think its a problem with diskspace. Any hints are welcome. Please help. Thanks in advance... Dirch +----------------------------------------------------------------------------+ | Dirch Scheer email: scheer@stadt-mh.de | | Amt 10-3 Tel. : +49 208 455 1006 | | Stadtverwaltung (snail-)Mail : Ruhrstr. 32 | | Muelheim an der Ruhr D-45468 Muelheim an der Ruhr | |----------------------------------------------------------------------------| | Inspiration gave them the motivation to move on out their isolation | +----------------------------------------------------------------------------+