12387976: errors Missing file format id in file: applcust.txt

Problem Summary---------------------------------------------------
Patch Fails due to applcust.txt after PCG module installation

Problem Description
---------------------------------------------------
PCG installation is done our current EBS environment as per Oracle procedure. New Custom modules are added as part of PCG installation. The instruction and installation media are provided by Oracle.

Now while applying any patch , we are facing issues due to presence of applcust.txt file and the patching error is:

Reading customized files list (if any)...

AutoPatch error:
Missing file format id in file:

/u01/apps/erpu2/appltop/admin/applcust.txt

This version of AutoPatch requires a file format id
on the first line of the file.