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We have tried to make a DFF column to readonly using form personalization. We tried use the oracle standard package fnd_descr_flex.update_definition but it is not available in R12.2.4 version.
Please let me know the correct API name or anyother process introduced in R12.2.4 ?
fnd_descr_flex is a forms library, not a database package. I don't believe you will be able to utilize this using forms personalization.