Bolas (3 Ball) was flagged as with this error:
11:07:39.782 SEVERE Thread-14 AbstractReferenceManufacturer:921 More than one Equipment with key/name Bolas (3 ball) was built
11:07:39.783 SEVERE Thread-14 AbstractReferenceManufacturer:931 Sources: file:/J:/pcgen/pcgen_trunk/Trunk/pcgen/data/3e/mongoose_publishing/collectors_series/quintessential_fighter
The issue was the names were not exact matches. Refining the error message to clarify this aspect would have made solving it much faster.
A message like "Two or more items with same key name patterns exist, but do not match cases exactly."
Differing cases now get called out. e.g.