Role of Business Partner in EWM

Hi,

I have a general question about BP in EWM.

I have a plant number and send from ERP to EWM with CIF and it is found in Location Type 1000.

But i am not able to find plant in Party entitled to dispose while maintaining Product master wareshouse.

So my question is that it is mandatory to maintain Business Partner for plant in EWM to use it as party entitled to dispose ?

If it the Case, do i need to maintain all Vendors and Customers as BP in EWM ?

or there is any other way so that system create same record in BP as External Vendor R/3 ?

Regards,

Pardeep malik