Incorrect internal simulink identifiers detected between DocBlock and signal routing?

I use blocks from the signal routing library on Simulink, and also the DocBlock as part of documentation. When I tried to close my model I got this warning:

As it says, after i save and reopen the model, there is no more warning, all good, as it has resolved the identifier conflict.

Just to have it documented here, and to ask if any others have had similar problems? This seems to be too odd that two simulink library blocks have conflicting identifier!

Thanks Raj