Field help (SFICVACITM) 

Enter or select the tax level.

This tax level and the threshold information are used to determine the application conditions of an invoicing element.

If the tax basis falls within the ranges of the threshold, the invoicing element will be applied to all invoice lines.


Particular case:
If the tax level is not specified but a threshold range is, the excluding tax amount of the document is taken as the tax basis.