Standard meaning for SHC in UDC 42/FR. Is there one?

I believe the special handling code (SHC) for any UDC is used to tell the AAI's what to do. I am particularly interested in UDC 42/FR. This one controls freight handling codes and the SHC controls whether to created billable freight, payable freight or both.

Does anyone have a "standard" for how these are step up or is every company using these differently?

We are using JDE 9.1.

Thanks in advance for any replies.