Written Form. 仅限以书面形式对本采购条款以及供货商和客户之间的其他合同协议进行修改和补充，否则无效。该原则同样适用于偏离书面形式的要求。
Written Form. Any legally relevant amendment, change or supplement to these Terms and Conditions and the entire Contract shall only be valid in writing and signed by both Parties. Constitutive declarations shall be considered to be in writing if made by email and sent to the duly authorized representative of the other Party.
Written Form. 仅限以书面形式对本采购条款以及供货商和客户之间的其他合同协议进行修改和补充，否则无效。该原则同样适用于偏离书面形式的要求。 In order to be valid, any changes or amendments to these T&Cs of Purchase or other contractual agreements between Customer and Supplier shall be carried out in writing. The same applies to deviations from the requirement regarding written form.