Question : selecting non matching records

I am trying to build a file that will contain records not having a match in my payments file. I am trying to use a method I found in the knowledge base:
This is my From and where:
 from MSB_FFFA_WORK_SUB, msb_fffa_work_pym
where
MSB_FFFA_WORK_SUB.DOC_NO *= MSB_FFFA_WORK_PYM.DOC_NO and
MSB_FFFA_WORK_PYM.DOC_NO is null

The MSB_FFFA_WORK_SUB and MSB_FFFA_WORK_PYM files look correct, However there are records that have a match in the pym file, and still a record is being created for it. I am very new to sql. any suggestions?

Answer : selecting non matching records

Try below. There are other ways to do this as well if this is not the results you are hoping for. 

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select
  whatevercolumns
from msb_fffa_work_sub t1
where not exists ( 
                   select
                     *
                   from msb_ffa_work_pym t2
                   where t2.doc_no = t1.doc_no
                 )
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