We have a problem with a very very very old program made in Cobol. The program was running well but it prompts an error when we choose one of the menu options. The error point to an .inx file. We need to check that file and corect the error in order to continue to use the program.
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I haven't done any COBOL work since 1980 but this is the kind of data debugging I used to do. I'm guessing you are missing an edit check and getting an OC7? or something like that.