I think it is, but I don't know how or why its used. If you generate previs any adjacent cells not within that cluster can sometimes have XPRI records added to them. I don't know what causes some to be added, but removing previs records for the center adjacent cluster cell mostly works. In this case I updated previs for POICC07. A XPRI record was added to AbernathyFarmExt. While within the POICC07 that refs mesh were not rendered and it required updating previs for AbernathyFarmExt for it to be seen in within POICC07. See: https://imgur.com/a/gaBTSez