Linking table BSEG and PA0001 to display PA0001-SNAME

I am working on a report where I am facing problem with field length compatibility.

I have to pass value of field BSEG-HZUON to PA0001-PERNR and display SNAME in the output.

But the field length of HZUON and PERNR does not match each time, hence SNAME is displayed as blank in the output for these cases.

Please suggest a solution to this problem or possibility of using some other field as a linkage between tables BSEG and PA0001.