Crossjoin Not working in BusinessPartners and EmployeesInfo ?

Hi Expert ,

I want to use CrossJoin between two Entity (BusinessPartners and EmployeesInfo) .As per service layer documentation i have wrote below join but not working .Please give me suggestion .

Get Request : https://10.0.0.181:50000/b1s/v1/$crossjoin(BusinessPartners,EmployeesInfo)?$expand=BusinessPartners($select=CardCode),EmployeesInfo($select=SalesPersonCode )&$filter=BusinessPartners/SalesPersonCode eq EmployeesInfo/SalesPersonCode

Respone : { "error": { "code": -1000, "message": { "lang": "en-us", "value": "Internal server error." } } }

Thanks

Surajit Kundu