The package we use, Infor LX, specifies the fields in all of their logical files.
This has come in handy for playing around with temporal tables. I could add new columns to the base table with SQL ALTER table to support the new column types needed and the RPG programs would not need recompiling.
A previous accounting package used subsetting of fields, substringing, etc in their Y2K migration. The old table name became a LF. This way your RPG programs could keep running without recompiling and when you were ready for bigger date fields you could choose the newer table and recompile.
Rob Berendt
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