I have used panel ARDL estimation technique in one of my studies in progress. My question is: How to apply model stability and diagnostic tests (CUSUM and Heteroskasticity) in Eviews while using Panel ARDL?

Mamvura, K., & Sibanda, M. (2020) in their study titled 'Modelling short-run and long-run predictors of foreign portfolio investment volatility in low-income Southern African Development Community countries' have applied model stability and diagnostic tests (CUSUM and Heteroskasticity) in Eviews while using Panel ARDL.

However, when I select Panel ARDL method from the options available in drop-down list in Eviews, it does not show the option for CUSUM and heteroskedasticity tests. Is there any alternate way to test the Heteroskedasticity and model stability test?

Would appreciate any help or guidance.