Hi
If you have field "price" and your number standard is 1234,56 and if you want calculated value stay the same format 3456,78 then in SEBLOD settings General set "Computation Format (Output)" to NO.
Otherwise it will take one of these:
1,234,567.89
1 234 567.89
1 234 567,89
1.234.567,89
Regards