upgraded to TIA Portal V13, can't get online with any FC/OB

I have a Tia Portal V11 project, I've upgrade to Tia Portal V12 SP1 (more or less, at the time I got an error).

I've made some changes and download to CPU 1214 and KTP600, with TIA Portal V12 SP1 (it say that this is a V11 project, but the ext is .ap12).

I've send my project to my costumer, he has TIA Portal V13, it opens, say it must be upgraded, I press yes, and a new project ..._V13 is created, without any errors.

After that he gets online, with the CPU, but can't get online with any FC/OB, it says that he must use Tia Portal V12

What can I/he do?

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New subject after splitting from TIP: How to convert a V11 project to V12.