Do I have to cancel my corporate contracts everytime I add some new corporations? (Golden Rainbow)

Either things on the server get out of sync, or Im not doing this right.

I've set up my common market contracts, but when I add new corporations and want to get their products into the market as well as buy supplies from my other corporations things get out of whack.

Like I said, I've got my current corporations common market contracts setup, and now I've added 3 more corporations, I want to put up the 20% to the common market and buy the supplies these new corps need from my local market.

I go back into the common market area, and choose the contracts for products my corporation produces and put in 20% again and confirm, but this whacks out all the existing corporations contracts and I get the red blip telling me that Im trying to sell more than I currently produce, sometimes it's a legitimate message and other times it's a bogus message, in the case of one corp, it said IM contracting out more than I produce

The exact message I get on the corporation page is:
Contracts not kept. The quantity promised in contracts exceeds the current production. Check your contracts.

I check the contracts heres what it shows:

Existing Contracts
in Units % of Production
Local Market Contracts 2,152,375 69.26 %
Common Market Contracts 0 0.00 %
International Contracts 0 0.00 %
----------+ ----------+
Total Contracts 2,152,375 69.26 %
Production Last Month 3,107,594 Click to see history

Do not offer more in contracts than what you produce. If you have accepted contracts with international partners, you might want to cancel those in favour of your local- and common partners.
Market Price 459 SC$
Current Stock 0
Product Retained For Contracts 2,107,375
Production Last Month 3,107,594 Click to see history
Estimated Produc