Online ALTER table problems

Hello Informix Administrators! I have a problem when trying to do the following command: ALTER TABLE Geraet DROP CONSTRAINT Geraetfk13; The message I then receive is : 242: Could not open database table (ar.organisation). 106: ISAM error: non-exclusive access Also repeating the alter table command does not help me. O.K. may be there is some access to the table "organisation" at this time. My Question: How can I find out which user and process holds the access (lock or whatever) that disallows my ALTER TABLE ? Is the reason a lock from a transaction or a open cursor or is both possible? Thanks in advance Achim -- ========================================================================== / Achim Reiners Software Engineering \\ | /M/A/I Deutschland GmbH | | Softwarezentrum Koeln Phone: +49 221 956400-40 | | Mathias-Brueggen-Str. 85 Fax: +49 221 956400-69 | \\ 50829 Koeln E-Mail: ar@mai.de / \\_________________________________________________________________________/