I think the use of calculated field is different than in the BDE or
IBX. The first time I use the oncalculatefield event I saw the ARow,
and AField parameters which the BDE/IBX does not have. And when I go
through the IBO help file it say that ....

"It is very important that the calculations be done in the context of
the IB_Row parameter which is passed into the event. Otherwise, you
could be basing calculations for one row using data from another row.

This is possible because IBO handles lots of different row types,
especially when working with the buffered datasets."


... that's it. I dont have the idea of how to write the calculation