Hi Sergey,
My apologizes for the delay caused on this issue.
Before calculating summary count in a AuxilaryList, try setting the Table.TableDirty to true. Here is a code snippet.
ChangeAuxilaryData(1, "16");
m_oEngine.Table.SummariesDirty = true;
m_oEngine.Table.TableDirty = true;
iCountAfterAuxilaryListChange = CalculateNestedSummaryCount();
Please refer to the attached sample for modification.
CollectionWithRelatedMasterGrouping.zipThanks for you interest in Syncfusion Product.
Best regards,
Haneef