In case Luke's version of the dictionary fix is not for v2017, you can carefully make the same changes yourself after doing a backup. I would do this right on the client's system:
1) DFDM SY0DCT.SOA and find the PR.FSEFILEB001 key. Notice the ""B"" in the key. This is the 1st B record (DEPARTMENT_NO) and these are the ones that appear in the Data tab in V/I if 75,1 = D or B. Currently it's an R
2) Click Edit. Field No = 1, Starting Position = 75, Length = 1
Change the R to a B
3) Go to the next B record for EMPLOYEE_NO and do the same.
4) Repeat through the SEQUENCE_NO. You've now finished with the key fields.
5) Now edit any B records for non-key fields you want to expose.
6) After Steps 1 - 5 are complete, click on File > Run > SVCMPL > choose Select All or Payroll > Proceed
7) V/I - Import Job Maintenance. Try the Data tab now. Note better to create a new job than modify existing one.
Hope it helps.