PSVI - err:XD0022 vs. err:XD0023

What is the difference between err:XD0022:

"It is a dynamic error if a pipeline attempts to evaluate a step where
the psvi-required attribute is true and the processor does not support
passing PSVI annotations between steps."

And err:XD0023:

"It is a dynamic error if a processor that does not support PSVI
annotations attempts to invoke a step which asserts that they are
required."

They seem to be the same to me.

Regards,
Vojtech