Why manually renaming a record takes little time?

In Dynamics NAV, if you try to modify the primary key field values it will take little time to change the value and also shows the window processing different tables.

When you try to change the primary key field value, internally it will check for the fields in all the tables which has the table relation to the primary key. That means system will check for the foreign keys related to the primary key and change the field value to the new value.

Let’s say you have tables like sales header & sales line and if you want to reflect the primary key changes in the sales header to sales line, provide the table relations in the sales line.