There's also a question of liability if credit was given by a school for something that was allegedly previously covered and later on there is an incident that involved that segment of training.
I think the fact of a student moving between multiple schools has been implicated in accident investigations.
They did at one time, I think since the IFT program was started, civilian schools were done away with.
Ours (RNZAF) - not yours
I should have been more clear...