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This feature provides a way to attach one or more prerequisite patches (standard or custom) to a given custom patch. However, it relies on the underlying Oracle patching utility (adpatch) support. For Release 12 and above, the prerequisite validation support from Oracle patching utility has changed and can no longer be used for custom patches. Hence, this feature is not available for Release 12 custom patches.
As a workaround, I would suggest either to document the prerequisites for the given custom patch and follow it during patch deployment or to ensure that all files within the prerequisite patches are directly included into the given patch.