Have you applied the Latest RUPs R12.AD.C.Delta.8 (Patch 21841299) and R12.TXK.C.Delta.8 (Patch 2183
Review the Applying the Latest AD and TXK Release Update Packs to Oracle E-Business Suite Release 12.2 (Doc ID 1617461.1)
This document describes how to apply the latest Oracle Applications DBA (AD) and Oracle E-Business Suite Technology Stack (TXK) release update packs (RUPs) to Oracle E-Business Suite Release 12.2.
Note: The latest RUPs are R12.AD.C.Delta.8 (Patch 21841299) and R12.TXK.C.Delta.8 (Patch 21830810).
You should periodically check this Document 1617461.1 on My Oracle Support for updates, which are made as required. For example, new bundled fixes or critical one-off patches may become available, or the release update packs may be superseded by newer versions.