22.4.10 Supply units
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The supply unit as secondary supply source
If you are using limited supply sources, a supply unit which is located on a city or port hex which is in limited supply acts as a secondary supply source. It is a secondary source only when actually located on such a city or port, and loses this ability the instant it moves off the source, or the source is no longer able to trace the necessary route back to a primary source.
Background/Purpose: Under limited supply sources, capital cities are no longer secondary supply sources but instead are limited supply sources, like any other captured city or port. However, stationing a supply unit at one of these locations does make it a secondary source -- sort of like a supply depot.