Hide column in a data model

Summary:

Hi Team, We have requirement to generate an XML output with parent and child relationships for AR invoice data.

We have created a parent dataset with customer_trx_id and joined this to various data sets like BillTo, ShipTo, InvoiceLines etc., In all the data sets customer_trx_id has been included along with parent dataset. However, this column is not required for client in the output and there is no option to delete it from an RTF template as template is not being considered for XML output. Can some one please help if there is any option to hide column in BIP data model or suggest an approach to hide this primary key column from report output in all data sets.