Time when a sum calculation is performed

[PatriciaW]

I have an application which was converted from FM6 to FM7.

This application had two related tables (table1, table2) which have a one to many relationship. Table1 has a calculation field (sum1) which calculates the sum of a field in related records in Table2. This calculated field is displayed on a layout along with fields from table1 and table2 (in a portal.)

Sum1 only seems to get calculated when the first row is added to table2's portal if one is tabbing from field to field.

I understand that this is due to a change in behaviour between the two versions. Is this correct?