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This statement is not allowed in classes and declares a data object table_wa as a table work area whose data type is adopted from the identically named structured data type table_wa from the ABAP Dictionary. table_wa must be defined as a flat structure in the ABAP Dictionary. You can specify database tables or Views for table_wa.
Work table areas declared with TABLES are interface work areas and should only be declared in the global declaration section of a program for the following purpose:
The statement TABLES is required for exchanging data between screen fields that were defined in a program screen when transferring from the ABAP Dictionary and the ABAP program. For the screen event PBO, the content of the table work area is transferred to identically named screen fields; for PAI, the system adopts the data from identically named screen fields.
In executable programs, flat table work areas can be used for adopting data that were provided for the event GET table_wa from a linked logical database. TABLES is synonymous with the statement NODES for this purpose.
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