Evaluation Capacity Requirement

Hi all,

I have some problem when evaluate requirement of work center while make production order.

So, i think i should check overall profile and work center, but I'm using ECC system of SAP and this system just for training, I use data exist in system to test. So, i don't know how to show capacity requirement, I checked period in setting/general but not effect. I checked capacity in production order but the system inform that no requirement. So I don't know why "no requirement"

Please tell me how to solve this

Thanks, regards