Problem with row deletion on Matrix

Hi.

I have a problem with row deletion on Matrix.

After row is deleted sum of particullar column disappers.

Here are my parts of my code:

1) Definition of sum for column

2) Row deletion

     frm.DataSources.DBDataSources.Item(dataSourceIndex).RemoveRecord(recordNo);

     oMatrix.LoadFromDataSource();

After row deletion the summary of cQuan column is empty.

Any help will be appreciated.

Best regards,

Pawel