IR Pooled assets- Hong Kong specific practice on retired assets

Summary:

Hello,

As per the current system, there are some assets that are that are allowed to depreciate(annual allowance) after retirement as well. To comply with this, they calculate every year the asset NBV disposed vis a vis sales proceeds. The difference is added to a shell asset called IR pool asset depreciating at say 10%. This IR pool asset every year will have adjustments based on the retirements made in a specific year.

Over the years, it has happened so that proceeds on assets were so much more than the NBV retired that the cost of this IR shell asset became negative. Please see an example of how it is done and suggest if there is any feature/localization specific to HK that allows this.