Diagnosis
The system could not lock replenishment data.
Before the replenishment data (table WRPL) of a customer is changed,the relevant table entries must be locked to prevent data fromelsewhere being written to the table.
If no material is indicated in the message text, none of the customer'sreplenishment data could be locked.

Procedure
Contact your system administrator, who can analyze and correct thecause of the error.

Procedure for System Administration
Find out which processes/programs write to the replenishment data ofthe customer at the same time.
In future, try to implement suitable organizational and administrativemeasures to ensure only one write access takes place at one time.