Work Order for External Procurement PR incomplete

Hi SAP ,

I'm having this problem when try to create Purchase Requisition for external procurement from work order using Operation Control Key PM02.

Below is the system message for Work order completeness check ;-

I already check the configuration, and it already maintenance default PR type NB. As per my knowledge, i do not need to define

PR type because system will take the PR from the configuration.

is there any missing configuration that i did not notice? kindly help