Remi,

>>- Heavy data input at the same time (order entry).
>>- Orderlines which belong to order x ends up in order y.

Sounds like a problem with assigning keys and getting duplicates. Or maybe using SYS(3) to assign a temporary key or temp filename while creating the order?

>>This application is used on 500 companies + and this problem only occurs when it is used with terminal server.

Perhaps the same problem would occur if you were running under FP/UNIX (happened recently on an old system I'm maintaining, when they upgraded the server to fast CPU -- it was SYS(3) ). Same principle as Terminal Server -- processing on the server, so 2 or more data entry people could get the same ID or temp filename, thus mixing the lineitems.

>>- Yes multiuser is dealt with correctly.
How do you assign keys and temp filename? Any use of SYS(3)?