4GL/RDS problem with reports

Hello INFORMIX-gurus, I've encountered a strange error within a report. Sometimes (the error cannot be reproduced) I get the following error message: Date: 20.3.1995 Time: 13:42:05 Program error at "repfvfg.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 796 in "repfvfg.4gl" you can see this: START REPORT r_red I have not created the table "dirch.t_r_red" anywhere. So I think it must be a temporary table, created by informix itself. But if it is a temporary table, why is it locked by another user (I am the only one, who is working with the account "scheer")??? Has anybody detailed information about the report processing??? I do not know, where to search for the error. Any hints are appreciated. Thanks in advance... My configuration: INFORMIX-Online V4.10.UC1 INFORMIX-Star V4.10.UC1 INFORMIX-4GL/RDS V4.11.UC3 -- +----------------------------------------------------------------------------+ | 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 | +----------------------------------------------------------------------------+