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We had a requirement to develop a functionality such that Whenever orders are manually entered, and the customer material is required to appear on the sales order, CMIR and MD (when working together) does not always retrieve the customer material properly.

So we need to make an Enhancement of VB12, VD52 so that whenever the substitute material in material determination(VB11/VB12) is changed, the corresponding material in the CMIR record (VD52) is also changed automatically.

If no default value is provided in foreign key column this rule could not be implemented.-- Script 1: Create sample tables-- Use required database Use Adventure Works GO-- Create child table IF EXISTS (SELECT * FROM sys.objects WHERE name = N'Emp Education' AND [type] = 'U')DROP TABLE Emp Education CREATE TABLE Emp Education(Edu ID SMALLINT IDENTITY(1,1) PRIMARY KEY,empno SMALLINT NULL DEFAULT 100, Degree Title VARCHAR(50))GO-- Create parent table IF EXISTS (SELECT * FROM sys.objects WHERE name = N'employees' AND [type] = 'U')DROP TABLE employees CREATE TABLE employees(empno SMALLINT PRIMARY KEY , Emp Name VARCHAR(70))GO The foreign key relation can be created either through SSMS GUI or T-SQL.

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The following script adds "ON DELETE CASCADE ON UPDATE CASCADE" -- Script 5: Create FK relationship with CASCADE-- Create FK relationship IF EXISTS (SELECT * FROM sys.objects WHERE name = N'FK_Emp Education_Employees' AND [type] = 'F')ALTER TABLE Emp Education DROP Constraint FK_Emp Education_Employees GOALTER TABLE Emp Education ADD CONSTRAINT [FK_Emp Education_Employees]FOREIGN KEY (empno)REFERENCES employees(empno)ON DELETE CASCADE ON UPDATE CASCADE GO -- Script 6: Create FK relationship with SET NULL-- Create FK relationship IF EXISTS (SELECT * FROM sys.objects WHERE name = N'FK_Emp Education_Employees' AND [type] = 'F')ALTER TABLE Emp Education DROP Constraint FK_Emp Education_Employees GOALTER TABLE Emp Education ADD CONSTRAINT [FK_Emp Education_Employees]FOREIGN KEY (empno)REFERENCES employees(empno)ON DELETE SET NULL ON UPDATE SET NULLGO For utilizing the SET DEFAULT rule for update/delete operations default value should be there for foreign key column.

However if nothing is specified then the default rule is No Action.

The rule may be changed to any other option at any time later by recreating the FK relation.

Associated values in child table would be set to default value specified in column definition.

Otherwise basic requirement of FK relation would fail and delete operation would not be successful.