How to stop gain/loss calculations at retirement, by category?

Summary:

Within our tax books we flag certain asset categories as Not Depreciable; therefore when they are disposed, the full acquisition value of these assets is shown as loss.

Content (required):

Within our tax books we flag certain asset categories as Not Depreciable; therefore when they are disposed, the full acquisition value of these assets is shown as loss. We are looking for options to see if there is a configuration at the category level (or somewhere else) that can be set so the system does NOT compute gain/loss on these assets. Please advise.

Version (include the version you are using, if applicable):