Preference Management in GTS e4H for Intercompany Sales scenario

[sunny_24]

Hello Gurus

I would like to know what the standard process is for issuing vendor declaration to end customer, in case Intercompany sales scenario:

There are 2 sales organisations : A and B (2 distinct companies) - B creates sales order to end customer and A produces and delivers goods to end customer. 

There are 2 invoices:

1. Inter-company invoice between A and B. 

2. End customer invoice from B to end customer. 

Both the invoices have plant of the producing company A. (Also, the outbound delivery has the plant code of company A) 

Issues/Questions

1. What is SAP Standard and who is legally authorised to issue vendor declaration to end customer? - Company A, who has the preference data of the product or company B who issues invoice (and has sales order) to end customer? 

2. Since plant is used to determine the administrative unit in GTS, both the invoices land into the same Administrative Unit of company A. However, our business requirement is that company B should issue LTSD to customer as it has the "sales contract" with the customer.  But since A has the prefect result of the product, LTSDs need to be exchanged between A and B. 

I would like to know what SAP standard in case of Intercompany Sales is. 

Thanks for the help in advance, 

S