SAP Message RSDMD174 - User &2 locked the load of master data for characteristic &1

Diagnosis
User &V2& is preventing you from loading master data for characteristicV1. the lock was set by the master data loading process with therequest number (DataPackage number) &V3& on &V4&.

System Response
For reasons of consistency, the system cannot allow the update tocontinue, and it has terminated the process.

Procedure
Wait until the process that is causing the lock is complete. You cancall transaction SM12 to display a list of the locks.
If a process terminates, the locks that have been set by this processare reset automatically.