What is difference between .include and .append structure?

Include structure:-

allows adding one or more structure into structure or table. Also placed positioning anywhere.Up to 6 include structure can be used in a table.

IT Requires Database Utility.

Append structure:-

can be placed only at the end of a structure or table which also stops further insertion of fields. Only one append structure can be used.

Append structure is used to add additional fields to standard SAP tables.

Append structure cannot be used with cluster and pooled tables.Append structure is included in a table/structure using.APPENDThe name of an append structure can begin with ZZ / YY.

The extra fields are added only at the end of the table structure.

Notes: Data element of Append structure start with 'ZZ' or 'YY'. 

Append and Include structure. 

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