In 2015, B.________ sent out a bulletin on a competitive bidding procedure for the supply of TFT displays. It contained the proposed contractual terms (the "corporate agreement" or “CA”), the General Terms and Conditions of Purchase (“GTC”), and Quality Assurance Agreement (“QAA”). A.________ was ultimately awarded the contract, and a contract award was signed. While negotiations on certain points of disagreement regarding the CA were ongoing, the parties went ahead and signed the QAA.