SAP ST ADDRESSING ROOT NODE documentation, setup help and usage info

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ST - Addressing the Data Roots
The data roots declared at the highest hierarchy level of an ST program are the root nodes of the tree structures of the data nodes of the main template . Addressing a data root during the execution of an ST program means referring to the bound ABAP data object.

Addressing When the Current Node is Undefined
As long as a data root is not shaded by the definition of a current node , you can access it directly using
root
where root is the symbolic name declared after tt:root .

Addressing When the Current Node is Defined
At any position of the main template, you can access a data root
root using
.root
where the period ( . ) bypasses a possible shading by a current node.

Note
In subtemplates , the rules for the root nodes of their tree structures apply.

SAP ST ADDRESSING ROOT NODE documentation, setup help and example usage