What it is on the BOM
The Omron R88A-CPM002S sits in the Servo Cables & Accessories class under Servo Motors and Components, so the BOM line is the cable/accessory side of an R88A servo drive run rather than a drive or motor itself.
What the code actually resolves to
The R88A- prefix puts this part inside the Omron R88A servo accessory family, used between an R88A servo drive and the matching servo motor on the power/feedback runs typical of that platform. For an integrator wiring into an R88A panel, treat the order code as the cable/accessory specifier — the drive-side and motor-side mating is what the rest of the R88A- family pins down, not this line.