SAP Message RSDD302 - Writing to aggregate &3 not possible due to block by user &1

Diagnosis The aggregate must be blocked for the creation of aggregate &V3& inInfoCube &V2&. The aggregate is, however, already blocked by anothertransaction from user &V1&. With the other transaction, we could be dealing with a creation of theaggregate, or with the maintenance of the aggregate or aggregate &V3&is currently being read for the creation of another aggregate. System Response The creation of the aggregates is terminated. Procedure Check why aggregate &V3& is being blocked by user &V1& and start thecreation of the aggregate again at a later date.