SAP Message 28051 - Reference to characteristic required

Diagnosis
The syntax check found an error.

System Response
The cursor marks the place in your entry where the error occurs.

Procedure
A reference to a characteristic is expected at this point. Please notethat you refer to a characteristic by entering the language-independentcharacteristic name. The reference can also can also contain areference to the object to which the characteristic refers, forexample:
COLOR
$ROOT.COLOR
Please note also other possible causes of error (messages).