Data Collection Rules: Triangular Deal Transactions 
A triangular deal transaction involves two companies. For example, company X, which is located in country A, sells some goods to its business partner, company Y, which is located in country B. However, the goods are shipped to country B from company X's warehouse in country C.
Note
You must set up tax codes for triangular deal transactions and assign the correct tax code to business documents. Otherwise, irrelevant triangular deal transactions appear in your declarations.
To set up tax codes for triangular deal transactions, proceed as follows:
From the SAP Business One Main Menu, choose
Administration 
Setup Financials Tax Tax Groups
.In the Triangular Deal field for the tax code, select a non empty value.
Declaration rules for triangular deal transactions
For a triangular deal transaction to be included in an Intrastat declaration, the following requirements must be met:
You have specified a triangular deal tax code for the transaction.
The declaration country is the same as the warehouse country in the business document.
For import: The warehouse and the default ship-to address of the business partner are in different countries.
For export: The warehouse and the ship-to address in the business document are in different countries.
If the warehouse in the business document is located in a different country from the declaration country, a triangular deal transaction (identified by a triangular deal tax code) is not declared properly.
Declaration rules for paired business documents relevant to triangular deal transactions
The tax code of the target document determines the declaration when one of the following occurs:
The posting dates of the base document and the target document are within the same month.
The posting date of the target document is one month later than the posting date of the base document.
The tax code of the base document determines the declaration when the posting date of the target document is more than one month later than the posting date of the base document. The triangular deal is declared only when the determining tax code is not empty.