SAP ST DATA DECLARATIONS

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ABAP_ST - Data Declarations
In ST programs, data can be declared using the following statements:

tt:root defines data roots for binding ABAP data interfaces.

tt:parameter defines parameters as formal parameters.

tt:variable defines variables as local data.
If these statements are specified outside of a template in the context of the transformation, the data declarations apply to the main template.
Within a subtemplate, the statements can be used in the element tt:context to declare local data of the subtemplate.