Patch 8218945 R12 pre upgrade patch failure

Hi,
Customer is on 11.5.10.2 and upgrading to R12.1.1
Applying 8218945:R12.PER.A  patch.  No upgraded to r12.1.1 yet.

AutoPatch error:
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This patch is not compatible with your current codelines.

This patch is compatible with: entity 'per' - codeline 'R12.PER.A'.
Your current on-site codeline for the entity 'per' is: 'R12.PER.B'.

Initillay they tried to apply it.  Since this is a pre install patch asked them.
Source the Applications environment file
    Run the Patch Application Assistant by entering "admsi.pl".

Adpatch Pre-install

Apply this patch in pre-install mode on the R12 APPL_TOP.
  Usage:
    adpatch preinstall=y