Field help (HDTMACSRE) 

This column is used to identify the installed customer base for which the consumption is carried out. This base MUST be chosen from amongst the customer installed base for the service request.
If no installed base has been entered and at least one installed base record has been entered in the request, then the consumption will be automatically assigned by default to the installed base record.
This information is used to evaluation at the level of coverage applicable to the consumption.