How To Fix UPC090 - Data requested in planning area &1 is locked by user &2

SAP Error Message - Details

• Message type: E = Error

• Message class: UPC - Planning: General Error Messages

• Message number: 090

• Message text: Data requested in planning area &1 is locked by user &2

What causes this issue?

If transaction data is requested in change mode, this data must be
exclusively locked for a user. The data currently requested for
planning area '&V1&' (planning level '&V3&', planning package '&V4&')
is already locked by user '&V2&'.
Background Information
The system locks the data that is described by the selection of the
planning package. However, the following rules apply in addition for
manual planning:
The selection comes from the planning layout for data columns and
individually defined rows in the planning layout.
In the remaining cases the selection comes from the planning package.
If variables are contained in the planning level or planning layout,
these are replaced for the determination of the selection.
Note that in Customizing, for variables of the type hierarchy node,
attribute, and authorization, the replacement of variables can lead to
many individual characteristic values:
For hierarchy nodes the system determines all characteristic values for
the hierarchy defining characteristic, which are contained in the
subtree and puts these in the selection.
For attribute values the system reads the master data for the attribute
and puts this in the selection.
For authorizations, the authorization object is read and the related
master data is read with the selection options of the authorization
object. The master data is then transferred into the selection.
Very complex selections can be formed in this way, which lead to a high
load on the lock server.

System Response

The requested data cannot be changed as long as another user has an
exclusive lock on this data.

How to fix this error?

Contact user '&V2&' if necessary, so that this user can leave the
planning transaction and thus release the locks.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.