Get the values from a table comparing fields of different data types

Hi Experts,

I want to fetch AFVC-AUFPL and AFVC- APLZL by passing WBS element from a ztable.

select aufpl aplzl

  from  afvc

  into TABLE gt_afvc

  FOR ALL ENTRIES IN gt_boq

  where projn = gt_boq-posid.

AFVC-PROJN - NUMC 8  (WBC ELEMENT)

ZTABLE-POSID - CHAR24 (WBC ELEMENT)

How to get aufpl and aplzl by comparing those 2?

Regards

Mani