%X As part of a migration from DigiTool to Rosetta, the Center for Jewish History wanted to change our cataloging practices so that staff would only edit descriptive metadata in Aleph – but still have that metadata be available in Rosetta. Ex Libris assured us that synching the two systems as we wanted, so that metadata updates would be pushed from Aleph to Rosetta, was possible! In reality, no customer had ever tried this before, nor did Ex Libris have any documentation on how it might be done. In this session we will (1) discuss the difficulties we faced in working with Ex Libris to invent a new workflow between the systems, and (2) show the Aleph and Rosetta configurations we eventually landed upon to make it work. %A Jaime Taylor %A Kevin Powell %C SUNY University of Albany %L eluna1767 %D 2018 %T Aleph–>Rosetta descriptive metadata synch