Building new corporations

Apologies to those who have seen this elsewhere on the forum, but it should reside more properly here, in the help section.

I have read this in the documentation:

'Enterprises with more than 700 corporations will not be able to start new corporations but their holdings will not be affected in any way. They remain free to purchase shares and play the stock market.'

Despite the 700 limit, I have been getting a message for some time (around 200 to 300 corporations) that I own too many corporations to build any more new ones. So why is this if I should be able to build until 700? Currently I have a little over 500.

Any help appreciated. Many thanks.

I will check.
it might be a free player limitation.

Thanks Andy,

I did check the benefits of paying for the game (and vice versa) but did not find anything there. Obviously, there is nothing in the main text either.

I would like to know the precise limit as I want a strategy that will allow me to build and with my current 500+ I am way off the mark, I think.