Maximum attribute

I keep getting the warning this player has reached the maximum attribute for your championship level (or words to that affect) when I manually apply training points. But I seem to be able to override this if I press it three times...

Can you tell me what the warning means and if the fact I can override is a glitch or if I'm wasting the training pints???
You can't go beyond the maximum attribute - if you really are doing, please raise a ticket, as it's a bug.
Ok will do- but can you just explain it please. Is it based on that players rating or the championship level I'm at. As the maximum level for a give skillet seems to be different for different players??? Thanks
The maximum attribute * total goes up 5 each level.