DC00131C error message returned after having upgraded DBC to 15.1

Document ID : KB000116936
Last Modified Date : 04/10/2018
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Issue:
CA Datacom CICS Service Facility (DBC) has been upgraded to release 15.1 and all the recommended maintenance has been applied as well (up to RO94697 in this case). 

However the CICS Service Facility fails to start because of the following error message:
DC00131C COMPONENTS OF THE SERVICE FACILITY ARE NOT AT THE SAME PTF LEVEL; DBCVTPR PTF = 92668 DCCOCPR PTF = RO97469

According to knowledge article KB000056972, the same problem was found in version 15.0 if the instructions listed in the HOLD ACTION for some PTFs (i.e. re-assemble/relink DBCVTPR) weren't executed, but there are no similar instructions for 15.1 PTFs.
Environment:
DBC 15.1 on any supported IBM CICS release
Cause:
The error message:
DBCVTPR PTF = 92668 DCCOCPR PTF = RO97469
implies that DBCVTPR is at PTF RO92668 level but this is a DBC 15.0 (not 15.1) PTF, so DBCVTPR is loaded from the DBC 15.0 CUSLIB, not from the 15.1 one. 
Resolution:
The transaction:
DBUT M=DBCVTPR 
can be used to check the actual release of this module.

Then Knowledge Article KB000019060 can be used to find out the CUSLIB library from which the DBCVTPR load module is loaded.