Error situations and codes for filedef
| Value | Name | Description | 
|---|---|---|
| -51 | FI_FILEDEF_OPENMODE_ERROR | Unable to open the file. | 
| -52 | FI_FILEDEF_ENVIRONMENT_ERROR | Environment variable that is used in filedef could not be found. | 
| -53 | FI_FILEDEF_FILEOPEN_ERROR | Substitution could not open the alias file. | 
The following additional topics on substitution appear in the following:
  - Substitution limitations
 - Debug features using an .INI file
 - Substitute with another record entry
 - Substitution examples