Data Dictionary

HI, 
  We have new file layouts to use in our EDI process and I have been told to 
create them, along with a Data Dictionary.
   
  I have never created one before and only used one very very briefly many 
years ago.
   
  I did a search in the archives but did not find much.
   
  As I am stumbling along on the Create Data Dict. command, I would love to see 
any examples of how to set one up. 
   
  THe data is EDI PO that is coming to us in 6 separate files from a 3rd party 
VAN.
   
  They are calling these flat files. The fields, are all alpha. 
   
  Do I enter all of the potential fields into the Data Dictionary? Or only the 
unique fields that will be referenced?
   
  In what ways are the Data Dictionary different from a Field Ref. file?
   
  Any and all help would be tremendously appreciated.
  Thanks,
  Mike

 
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