A right to non-monetary performance may be assigned only if the assignment does not render the obligation significantly more burdensome.




The assignment of a right does not in principle affect the obligor’s rights and obligations. However, to a certain extent the fact that performance is now due to another obligee can modify the conditions under which the obligation is to be performed. The place of performance may be different. The change of obligee may in itself render the obligation more burdensome. 


Article 9.1.8 entitles the obligor to be compensated by the assignor or the assignee for any additional costs caused by the assignment. That provision should be sufficient to take care of the problem in the case of the assignment of monetary obligations. However, when the assigned right concerns a non-monetary performance, the remedy may not always be sufficient. This Article excludes the possibility of assigning such rights when the transfer would render the obligation significantly more burdensome for the obligor.




1. Company X has undertaken to provide the security service aimed at preventing theft in warehouses used by company A for the storage of wood. The premises are sold to company B, which intends to apply them to the same use. Nothing in this provision prevents A from assigning to B its right to the security services provided by X.


2. The initial facts are the same as in Illustration 1, but B intends to use the warehouses for the storage of electronic equipment. A’s right to the security services provided by X may not be assigned to B: such services would become significantly more burdensome since the security risks are obviously much higher with electronic equipment than with the storage of wood.

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