Multiple ModifyAll on fields with filters

[christophstuber]

A common usage for ModifyAll is "change all records with this value to a new value":

MyTable.SetRange(MyField, 'OLD VALUE');
MyTable.ModifyAll(MyField, 'NEW VALUE');

This can become dangerous, if a second ModifyAll is performed on the same record.

MyTable.SetRange(MyField, 'OLD VALUE');
MyTable.ModifyAll(MyField, 'NEW VALUE');
MyTable.ModifyAll(MyOtherField, 'OTHER VALUE');

The first ModifyAll has caused all records to now be outside the filter, so the second ModifyAll has no effect.