You can use statements with MOVE-CORRESPONDING and the CORRESPONDING operator to assign values to structure components, especially when assigning values from a source structure to a target structure which have incompatible types and/or differently named components.
Both are used to assign identically named components of structures to each other.
The syntax also works for structures of the same type.
Also note the special conversion and comparison rules for structures in this context.
Note
The CL_ABAP_CORRESPONDING system class is available for making assignments. See the ABAP Keyword Documentation for the details.
The INTO clause of ABAP SQL statements has the CORRESPONDING addition. There, the following basic rule applies, which affects the value assignment: Without the CORRESPONDING ... addition, column names do not matter, only the position. With the CORRESPONDING ... addition, the position of the columns does not matter, only the name. See examples in the ABAP SQL cheat sheet.
The following examples demonstrate the value assignment using MOVE-CORRESPONDING statements and the CORRESPONDING operator with various additions. The focus is on flat structures only.
"Moves identically named components; content in other components
"of the targets structure are kept.
MOVE-CORRESPONDING struc TO diff_struc.
"Initializes target structure; moves identically named components
diff_struc = CORRESPONDING #( struc ).
"Same effect as the first MOVE-CORRESPONDING statement;
"addition BASE keeps existing content
diff_struc = CORRESPONDING #( BASE ( diff_struc ) struc ).
"MAPPING addition: Specifying components of a source structure that are
"assigned to the components of a target structure in mapping
"relationships.
diff_struc = CORRESPONDING #( BASE ( diff_struc ) struc MAPPING comp1 = compa ).
"EXCEPT addition: Excluding components from the assignment.
diff_struc = CORRESPONDING #( BASE ( diff_struc ) struc EXCEPT comp1 ).
Value assignments in deep structures
In the context of deep structures, there are additional syntax variants available for MOVE-CORRESPONDING statements and the CORRESPONDING operator.
The following examples focus on internal tables as structure components. Check out the syntax in action in the executable example.
"Nonidentical elementary component types are kept in target
"structure which is true for the below MOVE-CORRESPONDING statements;
"existing internal table content is replaced by content of
"the source table irrespective of identically named components
MOVE-CORRESPONDING deep_struc TO diff_deep_struc.
"Existing internal table content is replaced but the value
"assignment happens for identically named components only.
MOVE-CORRESPONDING deep_struc TO diff_deep_struc EXPANDING NESTED TABLES.
"Existing internal table content is kept; table content of the source
"structure are added but the value assignment happens like the first
"MOVE-CORRESPONDING statement without further syntax additions.
MOVE-CORRESPONDING deep_struc TO diff_deep_struc KEEPING TARGET LINES.
"Existing internal table content is kept; table content of the source
"structure are added; the value assignment happens like the statement
"MOVE-CORRESPONDING ... EXPANDING NESTED TABLES.
MOVE-CORRESPONDING deep_struc TO diff_deep_struc EXPANDING NESTED TABLES KEEPING TARGET LINES.
"Target structure is initialized; the value assignment for an internal
"table happens irrespective of identically named components.
diff_deep_struc = CORRESPONDING #( deep_struc ).
"Target structure is initialized; the value assignment for an internal
"table happens for identically named components only.
diff_deep_struc = CORRESPONDING #( DEEP deep_struc ).
"Nonidentical elementary component types are kept in target structure;
"internal table content is replaced; there, the value assignment
"happens like using the CORRESPONDING operator without addition.
diff_deep_struc = CORRESPONDING #( BASE ( diff_struc ) deep_struc ).
"Nonidentical elementary component types are kept in target structure;
"internal table content is replaced; there, the value assignment
"happens like using the CORRESPONDING operator with the addition DEEP.
diff_deep_struc = CORRESPONDING #( DEEP BASE ( diff_struc ) deep_struc ).
"Nonidentical elementary component types are kept in target structure;
"internal table content is kept, too, and table content of the
"source structure are added; there, the value assignment
"happens like using the CORRESPONDING operator without addition.
diff_deep_struc = CORRESPONDING #( APPENDING BASE ( diff_struc ) deep_struc ).
"Nonidentical elementary component types are kept in target structure;
"internal table content is kept, too, and table content of the
"source structure are added; there, the value assignment
"happens like using the CORRESPONDING operator with the addition DEEP.
diff_deep_struc = CORRESPONDING #( DEEP APPENDING BASE ( diff_struc ) deep_struc ).
Serkan AKKAVAK
Computer Engineer BSc
Head of SAP & Software Department
Contact : serkurumsal@yandex.com
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