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ABAP Objects in ABAP Release 7.52 ITOC
ABAP_MODIFICATION_NN Implementing Interfaces>
When implementing interfaces in classes with the statement INTERFACES>>, the following restrictions do not apply:
Methods and attributes of component interfaces of the implemented interface can now be specified after the additions ABSTRACT METHODS >, FINAL METHODS>, and DATA VALUES> using the name of the component interface and the interface component selector>~>. Until now, this was only possible for methods by using an alias name>, for attributes the interface itself had to be included.