This error seems to be persistent in our Dev environment and never went away. There was not enough time to spend research to completely solve it. The error was created as follow:
Another file, let's say CUSTOM.FILE, was checked out and modified in ST. For unknown reasons, INSTITUTIONS, which is in CORE, took CUSTOM.FILE's FIELD.FIELDS and made it its own (copied its data). Therefore, a duplication of INSTITUTIONS record exists in ST File Specs. Generating any process that uses fields from INSTITUTIONS will result in the above mentioned error.
I took the following steps to solve the problem. First, delete the duplicated INSTITUTION file.
DELETE FILE_SPECS
WHERE LOGICAL_FILE_NAME = 'INSTITUTIONS~ST'
Second, delete the I_INSTITUTIONS in ST.SOURCE. This will make the error go away.
