Diagnosis
For processing data in planning area '&V1&' the requested data has to belocked exclusively. The data currently being requested is recorded ina very large selection table. In order to be able to lock the dataexclusively, the system has to store a compressed version of thisselection table in the lock server. However, the compressed selectiontable has more than 999 rows. So that a reasonable number of users canwork in planning, the system limits the number of records possible in acompressed selection table. This limit is currently 999.

System Response
The requested data cannot be locked.

Procedure
This situation can usually only be avoided by simplifying selections.Consult SAP Note 635244.
If such complex selection tables occur when processing mass data, youcan separate these and execute planning functions consecutively.