EHS Activation in HCM

Hi Team,

we first implemented HCM module in SAP and going to implement EHS and our basis team activated EHS in sap where HCM already implemented in SAP system. will it affect HCM module anywhere., is it needs to be checked by tcode or any program . how do I check and make ensure that its not affected any of the HCM modules already implemented. please suggest.

Thanks & Regards,

Sridharan.K