Select the correct person responsible number while saving project in CJ20N(SAP PS)

Hi Experts,

I have already maintained person responsible number & name in production with T.code OPS6. Also while creating project in CJ20N I have already selected the desired person responsible from drop down list. After entering all user inputs & try to save the project system throws the error with message number ZPS000 as "Select the correct person responsible number ". What could be the reason? Any configuration or anything missed to maintain?

Thanks,

Prabhakar