BeginConfiguration Operation (Add/Default) not working for adding line item in a Quote.

Hi

I have below query on product configurator web service.

 

Query: there are 4 operation (Add/Load/Default/Set) in BeginConfiguration method of productconfigurator web service. There are below sequence of web services  when user want to add one line item to an quote.

1)      BeginConfiguration and operation (Add/Load/Default/Set)

2)      UpdateConfiguration and AddItem Operation.

3)      EndConfiguration and SaveInstanceFlag = Y.

 

As per my observation, for adding a line item in a quote when user uses operation Load and Set in begin configuration method and follow step 2 and 3, it adds line item in a quote.

When user uses a Add and Default operation in beginconfiguration method, and follows step 2 and 3, it does not add line item in a quote.