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ABAP Keyword Documentation → ABAP − Reference → Program structure → Introductory Statements for Programs →Syntax
TYPE-POOL tpool.
Effect
The TYPE-POOL statement introduces a type group. It must be the first statement of a type group following the triggering of any include programs. You can maintain type groups only in ABAP Dictionary in ABAP Workbench, whereby an ABAP program is automatically generated including the TYPE-POOL statement. The actual name of the program of a type group in the repository does not completely match the name of the type group and is of internal relevance only.
Type groups can only contain the statements
and the declared data types, constants, and macros must be prefixed with the name tpool of the type group. The elements declared in a type group can be addressed statically or dynamically by name in every ABAP program in which the type group can be used. This is loaded when an element of a type group is first accessed.
Notes
Example
Type groups with the definition of a table type.