3817033 - Why is the CD or Direct Bill number masked with XXXX when booking a car reservation?

When I book an Avis car the Direct Bill or Corporate Discount number is not syncing in the PNR. I tried to remove the direct bill number from the discounts section and added that in my test profile then also Direct bill didn't sync in GDS.

Avis Direct bill number is not getting captured in the Sabre reservation. , KBA , CON-TRV-ADM-USR-PRO , Profile , CON-CA , Cross Applications , CON-CA-TLS-IEM-IMP , Import Credit Cards , Problem