How can I validate that a calculated field is equal to a specific number?

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  Idea 1: This control file will check to see if the data to be loaded in Champ_1 contains a number (including the negative and decimal).

  load data
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  field_2 position( 1:10),
  field_1 position(11:20) "decode(trim(translate(:field_1,'-0123456789.',' ')),null,:field_1,-999)"
  ) 
  

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