SAP Message /ISDFPS/ACCMSG051 - Select a valid organizational measure (see long text)

Diagnosis
The organizational measure was activated in Customizing.
This means that organizational changes in the setup structure, exercisetarget, and operational structure, as well as the resulting accountassignment object assignments (cost centers, profit centers, and so on)must be made with reference to an organizational measure.
This message is also displayed if the "Based on Change Documents"processing mode was selected and no change documents were found for aselected valid organizational measure.

Procedure
On the selection screen, select a valid organizational measure to whichthe account assignment object generation must be assigned.
The assignment applies only to the current generation run. In otherwords, the organizational measure must be selected again for the nextgeneration run.