Existing partitioned by growth (PBG) table space with all partitions defined in Reordered Row Format (RRF). With the zParm RRF=DISABLE, a REORG TABLESPACE SHRLEVEL REFERENCE was run on this table space. During the RELOAD phase of REORG, a new PBG partition was created in mixed row format with the first row in Reordered Row Format (RRF)and the rest of the rows in Basic Row Format (BRF). A subsequent REORG TABLESPACE SHRLEVEL REFERENCE failed with ABEND04E RC00C90101 due to the inconsistent row format. A similar problem can occur with REORG SHRLEVEL CHANGE.