Requirment class in ECC and APO

Hello,

I need to know how requirment class in ECC is t/f to APO.

For instance if we create a new requirment class ZE. Do we need to create similar ZE check mode in APO.

Or

the requirment class will be CIF'd. If yes how. requiremnt class becmes check mode in APO.

regards

Pamela