Direct Access to Underlying DB

Hello all,

What are the community's thoughts on directly updating custom tables in the underlying RDBMS, outside of the SAP Application Layer? I understand that updating SAP Standard Tables outside of the provided FM's and programs is verboten, but how much flexibility are we given with Z-tables?

Our data is hosted in a DB/2 database, and I'd like to connect directly to the DB to populate a z-table that was created within SAP. The table doesn't have any dependencies on other SAP tables.

Thanks in advance for your input,

Jarrod