Message SAP VT525 - Requirement & not defined

Diagnosis
This requirement has not been defined in Customizing.

Procedure
Carry out the "Define Requirements" IMG activity (Transaction VOFM). Ifyou are using output control, choose Requirements -> Output control
and enter your application (for example, EF for purchasing) and therequirement. Choose Source text to enter your coding.
The number of the requirement must be between 600 and 699. Once youhave completed the source text, activate the requirement. See the IMGdocumentation for more information about this activity.
IF &DEVICE& = 'SCREEN'
Choose Maintain requirements
ENDIF