To include non stock item in the P rule

Hi

Quick question on setting up P rule for a configured item in E9.2. The requirement is to add few non stock lines items as part of P rule along with WO manufactured items. System is not allowing to add line types (N -non stock) in P3293 , since B/P field is mandatory to add a item number. Have tried to use floor stock, still system is not allowing or showing an error message as B/P record not setup.  Any idea or suggestions how to add non stock line item as part of Parts list in P rule definition.