4GL and Serial Columns

X Posted from Dev Tools IDS 9.40.FC6 (I know, we're in the process of upgrading) running on AIX 5.3 and using r4gl 7.32.FC3. On our test box a piece of 4GL code is creating a temp table with several columns the last of which is a serial column. It then executes a 'LOAD FROM .... INSERT INTO 'temp table' to load data from a system file. This file has a match for match set of delimited data to insert, except for the final serial field which is not present. Contrary to expectations this load is successful. Migrating the code to our live box (same IDS, O/S and 4GL) the LOAD fails with error 846 - Not enough columns, unless the serial column is added. This is the same whether the 4gi is copied or whether the code is recompiled. As far as I can tell the environments are identical. Any one seen this behaviour and can point me towards an environment or onconfig setting that might produce this difference? Thanks Keith