Yamaha price files put a special supercession value of '9999999999' to mean the item is no longer available.

Problem is that this is treated as a supercession resulting in all NLA parts redirecting to this ficticious part number.  Supercession and NLA are completely different things.

C9 lets you work around this. You need to tell C9 that 99999-99999 is actually a NLA marker, not a supercession.

Setup -> Utilities -> Main Setup Screne. Goto spares 2 and key in following into NLA field.

(NLA|NA|NLS|9999999999)

Reimport price file and it should come good. (Requires update to c9 to accept this value)

Will update central repo file for Yamaha at c9 shortly to do this as well.