PHP4 with Access/Paradox tables through ODBC : insert failes

Greetings I use PHP4 (under Windows 2000) with an ODBC database (Paradox files, but I made a test with Access too). SELECT works without troubles, but I get an error with both DELETE and INSERT : (both translated, ODBC talks to me in French ;-) Warning: SQL error: [Microsoft][ODBC Paradox Driver] Reserved Error (-5016); no message assigned to this error., SQL state S1000 in SQLExecDirect in e:\inetpub\wwwroot\WebCenter\add_user.php on line 30 INSERT INTO User (Login,Password,IsAdmin,IsOperator,IsUser) VALUES ('truc','chose',1,1,1) with Access : Warning: SQL error: [Microsoft][ODBC Microsoft Access Driver] The operation must use a query which can be updated., SQL state S1000 in SQLExecDirect in e:\inetpub\wwwroot\WebCenter\add_user.php on line 30 INSERT INTO UserList (Login,Password,IsAdmin,IsOperator,IsUser) VALUES ('toto','toto',0,0,1) No problem if I directly access the "DB" in SQL (with Borland Database Explorer)... The same code works if I replace Access/Paradox with a "real" database (MS-SQL 7), but I would rather stick to Paradox, since I don't need a particularly fast DB, and it is free under Windows (which isn't the case with MySQL). Any help on this? Thanks Thibault Dangréaux