  Operational flexibility needs assessment (FNA) is crucial for system
operators to plan/procure flexible resources in order to avoid probable network
issues. We implemented an FNA tool in the framework of the H2020 EUniversal
project for the German demonstration. In this work, we summarize our learnings
from the demo implementation to cope with the limited availability of
measurement data. Using a reduced network model and key performance indicators,
we evaluate the digital-twin results with real-world implementations. The paper
aims to motivate future research directions by duly considering real-world
limitations in their modelling and developing innovative tailor-made solutions
for an improved decision support framework for system operators.
