displaying employee job title on form

hi expert, i want to display employee job title (designation) on my custom form, the data coming from two different tables, hcmworkerposition details table and premployeementinformation,

i just add both data set on my custom form data set, and set property for join property on form for table HmcworkerPosition toPremploymentInformation, also add control field employee position on form and reference data source hcmworker position table,

but the data is not coming accurate..

please guide me.

Regards.