Field help (MACMACNUM) 

The identifier of an installed base record is always generated automatically by the system.
As a consequence, the Installed base object MUST be associated to a sequence number counter managed in an automatic fashion.
It is not possible to proceed with the copying of an installed base record.
However, another method giving a similar result is possible for products that are not managed with serial numbers.
It is only necessary to create an installed base record with a quantity higher than one and to then click on the [Split] button.
The system then carried out an n-1 duplication of the initial record.