Known Error sub-process

There are two references to Known error sub-process in the SO book.
For example Chapter 4 states:
Problem Management involves root-cause analysis ... and a Known Error sub-process to allow quicker diagnosis and resolution if
further incidents do occur.

In the Problem Management Process there is no reference to this sub-process and I cannot find the description anywhere.

CA has published a ITIL-at-a-Glance Process Map of V3 and I noticed that the process map has an Error Control activity. I tried to find it from V3 but it does not exist. The I found this KE sub-process but no description. According to V3 solved problem records must be left open if you do not have resources to fix them (

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