This is a blog menat to help SAP ABAP professionals & Beginners to help revise concepts and learn concepts in a single place to help prepare for interviews. It's under progress and not completed, but check it out if it's useful. Most important concepts to know for SAP ABAP: CORE ABAP: What is Foreign Key? Foreign keys are used to establish the relationship between the different tables present in the ABAP Dictionary. We can create value checks for input fields using the foreign keys. Value checks are required to validate the values of some fields in a table with the values of other fields of different tables. The table that contains the foreign key is called a foreign key table and another table that contains valid fields, known as the value table. It connects two tables by assigning the foreign key field of one table to the primary key field of another table. The below diagram shows the assignments of fields using a foreign key. Below are the two requirements for creatin...