What is cross-structure foreign key in SAP BC-DWB-DIC - ABAP Dictionary?

SAP Term: cross-structure foreign key

• Component: BC-DWB-DIC

• Component Name: ABAP Dictionary

• Description: A label for which a field of the work area that is not contained in the foreign key table was assigned to a field of the check table.

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• Key Concepts: 
  A cross-structure foreign key is a type of foreign key in SAP that links two tables that have different structures. It is used to ensure data integrity and consistency between the two tables. The foreign key is defined in the ABAP Dictionary and is used to join the two tables in a database query. 
  
  How to use it: 
  In order to use a cross-structure foreign key, you must first define it in the ABAP Dictionary. This involves specifying the source table, target table, and the fields that will be used for the join. Once the foreign key has been defined, it can be used in database queries to join the two tables. 
  
  Tips & Tricks: 
  When defining a cross-structure foreign key, make sure that the fields used for the join are of the same data type. This will ensure that the query runs smoothly and without errors. Additionally, it is important to ensure that all of the fields used for the join are indexed in both tables. This will improve query performance. 
  
  Related Information: 
  For more information on cross-structure foreign keys, please refer to SAP's documentation on ABAP Dictionary (BC-DWB-DIC). Additionally, you can find more information on database queries and indexing in SAP's documentation on SQL (BC-DB).