How is it addressed in your approved training program?
FWIW “135.297 Pilot in command: Instrument proficiency check requirements.” IPC and 297 are used interchangeably. Is the SIC required by the type or operations?
FSIMS Vol 3 Ch 19 Sect 7...
3-1280
H. SIC Qualification in Aircraft Not Requiring an SIC. The basic qualification module for an SIC in any operation (VFR or IFR) for which no SIC is required by regulation is either an instrument proficiency or VFR competency check in any aircraft of the same category and class and the written or oral test required by § 135.293(a)(2) for the type of aircraft involved.
Also, make sure you’re looking at the changes to 135.245 from last June.