Fixed assets can be sold and purchase by and to more than one customer/vendor.
It can also be done on more than one invoice and/or purchase order, but only one value is shown in the form of the Fixed Asset Book. Please change this to 'multiple', if this is the case. It would be more correct and less confusing to users who might think that the sales or purchase was done to only one party, instead of multiple for example.

Thanks!

Jasper